From hamburgers and French fries to hot dogs and meatloaf, there’s one condiment that you’ll find in just about every refrigerator around the country. What are we talking about? Ketchup, of course! Or is it catsup?

If you look in the condiment section at your local grocery store, you might find this popular tomato-based sauce labeled as either “ketchup” or “catsup.” So which is it?

You can actually call the substance by either name, as there’s no difference between ketchup and catsup. They’re just two different terms for the same thing.

Ketchup has been around a long time. The name probably comes from ke-chiap (sometimes written ke-tsiap), which was a pickled fish sauce popular in China. European traders loved the sauce and brought it west with them in the 17th century.

Others believe the name may have come from Indonesia, where kicap (or kecap or ketjap) was a sauce made of brined shellfish, herbs and spices. Whatever the exact origin of the term, Europeans began calling their version of the sauce “ketchup” as early as 1711.

The alternative spelling — catsup — popped up in a Jonathon Swift poem in 1730. For many years, you could also find the sauce called “catchup” in many places.

It would be another 70 years or so before the sauce recipe would incorporate tomatoes and resemble the condiment we know today. In the early 1800s, the tomato-based version of the sauce quickly became popular in the United States.

At first, it was made primarily by local farmers. By 1837, though, at least one company was making ketchup and distributing it around the nation.

The H.J. Heinz Company didn’t start producing the sauce until 1876. The company originally called it catsup, but soon switched to ketchup to stand out. Today, ketchup is the standard, while catsup is still used occasionally in the southern U.S.

Today, most ketchup — or catsup — contains the same basic ingredients: tomatoes, vinegar, sugar, salt, allspice, cloves and cinnamon. Manufacturers vary their recipes by adding vegetables, such as onions and celery, as well as other spices, including pepper and garlic.

145 Join the Discussion

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  1. That is a really “WONDER”ful video. It’s spelled both ways (I Think.) Hot Dog monster was really funny. I think tomorrow’s wonder will be about skateboarding! Again, thank you for the “WONDER”ful video.

    • Thanks for visiting us today, mteam132! We are so excited that you’ve been WONDERing about such a delicious condiment… ketchup (or catsup) seems to go with everything! We are lucky to have such a WONDERful Friend like yourself! Keep up the great work and we will see you soon! :)

  2. Thoughts: I think ketchup made of fish sauces sounds kind of gross. (Toby) I was disturbed when Mrs. Hess told us that her son, Evan, dips EVERYTHING in ketchup. (Joaquin)

    Connections: This reminds me of when Mrs. Willen came in yesterday and nominated a wonder because it had to do with fish. (Isaiah) This reminds me of when Isabel, Payton, and I were playing the dare part of truth or dare because we had a dare where we had to eat a tablespoon of ketchup. (Briahna)

    Prediction: What is 80s day? (Andrew) Have you ever met Mr. Radcliffe? (Michelle) What is Great Wolf Lodge? (Jaaron) Who is Michael Jordan? (Cristian)

    • Good morning Mrs. Hess’ Class! HOORAY for WONDERing on Friday! What a SUPER way to being the weekend. :-)

      Ketchup made with different ingredients might take some getting used to, we think you’re on the right track, Toby! It sounds like Evan has some ketchup-loving taste buds! Is anyone else in Mrs. Hess’ family a true ketchup lover, Joaquin!? :)

      Isaiah, we’re glad that you told us about a nominated Wonder from Mrs. Willen! We look forward to checking it out… we’ve got some research to do! YOWZA, that must have been a salty-tasting dare! Did you have some french fries on the side, Briahna, Payton and Isabel!? :)

      We love your famous predictions for tomorrow’s Wonder! Thanks for being such WONDERful, imaginative friends! :)

  3. We love ketchup!
    We think tomorrow’s wonder will be about something cool like a water park, or a storm.

  4. My dad used to always tell me that the real name for ketchup was catsup. We didn’t know how that came to be, just that is was catsup. I didn’t really believe him until now. Thanks, Wonderopolis!

    • It sounds like you and your dad can talk about the origin of catsup together thanks to today’s tasty Wonder! We are so glad you shared your connection, Madeline, and we bet your dad will be smiling… now that you believe him! :)

        • Good luck in your spelling bee, Nabeeha! We bet you’ll do a great job! Catsup and ketchup are both correctly spelled, it just depends on how you spell it. Sometimes it depends where you live that impacts how you spell this tomato-y spread! What do you think, Nabeeha? :)

  5. Comments: We really enjoyed the video today! We had lots of giggles. We loved the unexpected ending with the hot dog man!
    Predictions: Waterparks, Rain Forest, Surfing, Skateboarding in the rain .

    • Good morning, Miss Marsico’s Class! We’re so glad the Hot Dog Man made you smile! Thank you for sharing your comments and your awesome predictions for the next Wonder! We are so glad you’ve been using your awesome imaginations! :)

  6. Hey wonderpolis well yesterday I guessed this wonder and I was happy because it is amazing to think like someone else but I really think that my class is the smartest in the world and you guys can find us on our website. We’re awesome and you are too…………. YEAHHHHHHH……

    • Hey there, Isaiah! We LOVE your enthusiasm and we always enjoy WONDERing with you and your friends in Mrs. Hess’ Class! We are so proud of you and all you’ve learned — WONDERing ROCKS! Keep up the great work, Isaiah! We’ll see you again soon! :)

  7. Hi Wonderopolis!

    Our class liked the movie that you put on and the dancing hot dog. The movie was so funny!
    Some of us didn’t know that catsup was a name for ketchup! I didn’t know cinnamon and vinegar were in ketchup. Now some of us don’t want to eat ketchup anymore! Was the old ketchup still red?

    We predict tomorrow’s wonder will be about the rainforest, wild animals, surfing, the ocean, skateboarding, or the aquarium.

    • Good morning, Froggy 1 and happy Friday! We are glad this Wonder video made you giggle– it’s got us chuckling, too! It’s so interesting to learn about the ingredients in one of the most popular condiments– who knew!? Those tomatoes keep ketchup red, but ketchup has come in different colors… we’re not sure we would be as excited to eat green or purple ketchup!

      Thank you for sharing your awesome predictions about rad, soggy Wonder ideas! Great work! :)

  8. In science, we are learning about viscosity. That means how much a liquid resists flowing. Like ketchup is more viscous than oil. Nice post, but the video wouldn’t play for me.

    • What a SUPER connection to our Wonder, Delaney! We’re so excited that you told us all about what you are learning in class AND how it ties into our Wonder today! We’re sorry to hear that the video isn’t working for you… perhaps you can try it at another time from the library or at home?! :)

  9. (Alexandra) I didn’t know there were two different words for “Ketchup.” (Mubean and Luna) We love ketchup. (Dominic) The video was so funny. (Trevor) I like to drink Ketchup all by itself. :)

    We wonder- (Cameron) How are boats made? (Tatum) Can ketchup last forever? (Kirstin) How do they build walls? (Emma) I wonder if cats like the Ketchup with fish?

  10. Thank you so much! We love wondering and learning with you everyday. You are helping us to be wonderers of everything, which will make us lifelong learners.

    • Great work, Mrs. Glover’s K-Class! We couldn’t be happier to have awesome Wonder Friends like you! It sounds like Alexandra, Mubean, Luna, Dominic, Trevor, Cameron, Tatum, Kirstin, and Emma have been using their WONDERful imaginations today! We love the connections, questions and predictions– you have been doing a great job today! Keep up the STELLAR work! :)

    • We are so happy to hear that we made you laugh today, William! The Hot Dog Man to the rescue! :) We Wonder if you like ketchup (or catsup) on your fries and burger? Or do you like to put it on all types of food?! :)

  11. My mom HATES it; she won’t even be in the same room as it!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    • WOW, that’s good to know, Roody and I! We are glad you know how much your mom dislikes ketchup, but we Wonder if you enjoy it? Is it your dipping sauce of choice, or do you prefer barbecue, salsa, honey…? :)

    • It’s so awesome that you learned something new with us, Connor! It sounds like you’ve been WONDERing about food today– we hope your stomach isn’t growling from all this WONDERing! :)

    • That’s great, CW! Can you believe there are two ways to spell such a delicious dipping sauce? We Wonder if you are a ketchup (or catsup) fan yourself, CW? :)

  12. We liked the video it was kind of funny! What we learned is that we can call it catsup or ketchup.

    Thanks Wonderopolis!!!!!!!

    • Hey there, Diamond Divas! Thanks for visiting us on this fantastic Friday! We are glad today’s Wonder and video has you smiling! We hope you have a WONDERful weekend! :-)

    • Aren’t origins fun to Wonder about… like catsup to ketchup?! Thanks for telling us about what you learned today, Pinkpopstars! We are so glad you visited us today! Have a SUPER day! :)

    • Hey there, Berkleigh, we are glad you enjoyed today’s Wonder! It’s cool to learn about the original word used to describe that delicious, tomatoey dipping sauce! We think it’s cool to Wonder about how words can change over the years! Thanks for sharing your awesome comment today! :)

    • Hey there, Wonder Friend P! We’re glad you told us about what you learned today- how cool! Thanks for visiting Wonderopolis today! :)

  13. Hi Wonderopolis!


    Today’s wonder of the day was fun! We really enjoyed the video. We thought it was funny because the ketchup wouldn’t come out and then the hotdog squirted him with ketchup! And then, the ketchup finally came out. We really liked learning about the different names for ketchup (catsup).

    We think tomorrow’s wonder of the day will be very cool!

    HAVE A GREAT WEEKEND! Au revoir!

    • Bonjour, Ms. G’s Class! Ca va? :)

      We are so excited that you enjoyed our Wonder today– it seems like the topic of today’s Wonder would be great avec des pommes frites?! Oui?

      Thank you for sharing your favorite parts of today’s Wonder, we are so glad you visited us today! Have a super weekend and we look forward to WONDERing with you soon!

      A domain! :)

    • Hi Brooke, it sounds like you learned something new with us– how cool! Many of our Wonder Friends have commented about calling “ketchup” … “ketchup”! But now we know the origin of the word, and why “catsup” is sometimes used today! We are glad you visited us today, Brooke! :)

  14. Hi Wonderopolis! I like the word ketchup. Because that is the way I always say it. I also thought the video was really funny!

    • How cool, Holly, you are familiar with our Wonder today! It sounds like the video put a smile on your face… we’re still giggling from the video, too! The Hot Dog Man to the rescue! :)

  15. Hi wonderopolis!!!!!! I thought the video was cool and funny!!!!!!!!!!!!!!!!!! I NEVER heard of the word castup??? I WONDER what the next WONDER of the day is next!!!

    • Hey there, Epic! It sounds like you learned something totally new about one of the most popular condiments! How cool! Now every time you use ketchup (or catsup), you can tell everyone all about it! You’re a great Wonder Friend! :)


    • Hi there, Emily! We LOVE your enthusiasm, and we are so excited that you learned all about the history of ketchup (or catsup)! We are so glad this Wonder made you giggle! :)

    • We are glad you’ve learned something new and fun with us today, Ania! Great work! Keep up the SUPER WONDERing! :)

  17. Dear wonderopolis
    I have never heard of catsup before I can’t belive there is another name for ketchup I was so surprised! I think tomorrow’s wonder is about surfing or water holes.

    • Welcome back to Wonderopolis, Music Lover/Panda Lover! We’re happy that you had a great time learning something new– it’s fun to learn about the origin of things we use so often! Terrific guesses for tomorrow, Wonder Friend- great work! :)

  18. Hi today’s wonder was so cool did ketchup really go in bottles? That must of been hard so far that was the best wonder yet except for when will pigs fly that’s the best but that was pretty funny. I wish I have a ketchup in a bottle. I hope you have a wonder about mustard.

    • Good afternoon, Wonder Friend Jewels! We bet you will find some ketchup bottles at your local restaurant! Those bottles are easily filled and easily recycled, do many businesses use ketchup in bottles! We are glad this Wonder is one of your favorites… Hot Dog Man and Ormie the pig would be great friends!

      Check out Wonder #209 for more information about mustard! :)

  19. WOW! I love this website it is so cool how you think of wonders every day I am so glad you take your time making videos and going to that place I need to thank you like every day I love this keep up the good work. :)

    • Thank you so much for sharing your comment about Wonderopolis, Dojo Miranda! We are glad that you enjoy visiting us and we hope to Wonder again with you soon! Keep up the great work! :)

  20. HI Wonderopoplis

    I call ketchup ketchup. I’ve liked all of the wonders but this one is the one I like the most because it was funny.

    • We’re so happy to hear that you’ve enjoyed our ketchup Wonder, Madeline! Isn’t Hot Dog Man a funny one? Have a SUPER day! :)

    • Hey there, Chris! Thanks for sharing your comment and for WONDERing with us– even if ketchup isn’t your favorite! Have a great day! :)

  21. Hi Wonderopolis! Your video today was very funny. And I can’t wait for tomorrow’s wonder… I thought the walking hotdog was pretty funny. I learned that they still sell glass ketchup bottles and the ketchup can get stuck at the bottom. I can’t wait for you to respond!

    • Hey there, Bdog! Thanks for being a great Wonder Friend– we’re glad to know that our Wonder had you giggling and laughing all day long! Ketchup is so fun to Wonder about– who knew? :)

    • Hi Jack, thanks for WONDERing with us today! The Wonder video has us all laughing, and we’re glad you enjoyed it, too! We hope you have a WONDERful weekend, Jack! :)

  22. Hello Wonderopolis I do remember seeing ketuchup lables spelled differently and to think about the name ketuchup coming from tons of different places it’s cool. Sincerly grants bacon 3.60 .

    • Hey there, Grants Bacon! You have made a great connection to our Wonder today- thank you for sharing it! Now you know the story behind catsup, and ketchup! We are so glad you’re here! :)

  23. Wonderopolis, I think it’s weird that ketchup is such an old thing that we used in the 17th century. Kids love cartoons, and they they learn from it too! I love wonderopolis! It’s a great way to learn.

    • We’re so excited that you shared your favorite parts of our Wonder, Meredith! Thank you for being an awesome Wonder friend– you’ve pointed out the fun that comes with WONDERing and learning! :)

    • How cool, Olivia! You’ve learned all about the history of a product that is probably in your refrigerator! Way to go, Wonder Friend! Thanks for WONDERing! :)

    • That’s great news, Wonder Friend Sosol! We love to know that you enjoyed our article and video about ketchup! It’s so much fun to Wonder with a great friend like you! :)

  24. I think the video was so funny! I think it was also weird that they called ketchup catsup I wonder why they called ketchup kutchup and why that name. I will see what tomorrow’s wonder is.

    • Good afternoon, Wonder Friend *#25*! It sounds like you’ve got some more fun WONDERing to do about the history of ketchup– keep up the great work! We are so very glad you visited us today! :)

  25. Hi wonderopolis I love french fries but I hate ketchup I loved the video and can you do the video that I suggested please? bye.

    • Hey there, Jakob! Thanks for sharing your comment today! We are very excited to know that you liked our Wonder about ketchup! We have so many great Wonder Friends that it takes some time to check out all the Wonder videos and suggestions we receive! Thank you for visiting us today! :)

    • Thanks for sharing your comments, Andre and Jayden! It’s so WONDERful to know that you’ve been laughing and WONDERing with us today! HOORAY! :)

    • Hey there, Dominic and Wonder Friend E! We are glad you both shared your comments- it looks like you agree on the name, too! Ketchup it is! We are glad you visited us today and we look forward to WONDERing with you again soon! Have a SUPER day! :)

  26. _-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_
    Ha H!!! Ketchup-Man To The Rescue!!! (even Though He Failed)
    I Prefer Ketchup I Mean Catsup No No Ketchup… However You Pronounce It!!!

    I Wonder What’s Next???
    Tomorrow’s Wet And Wild Wonder Of The Day Is Totally Rad!!!

    If Tomorrow’s Wonder Is Totally Raaaaad!!! It’s Got To Be Surfing.
    Well See You Tomorrow Hope The Surfers Won’t be Attacked By Sharks!!!

    • Hey there, Max, we are excited you’re here today! We think you’re on the right track with tomorrow’s prediction… we think it’s going to be a wild ride indeed! See you there, Wonder Friend! :)

    • Good afternoon, Nick, we are excited that this Wonder is right up your alley! Thanks for sharing your comment and guessing tomorrow’s Wonder… it’s going to be a fun adventure! :)

    • We’re so glad you enjoyed today’s Wonder William! We have learned the majority of our Wonder Friends are in the same boat– it’s “ketchup” to them, too! :)

  27. Connections:
    Daisy – In Mexico, it’s called catsup.

    Griselda – What else can ketchup be put on besides the usual foods?
    Emely – What’s the process of making ketchup?

    • Thanks for sharing your comments today, Miss Komarchuk’s Class! We are glad we learned something new with you AND we are excited that you’re still WONDERing about ketchup (or catsup)! We hope you’ll continue to research the process of how ketchup is made… and maybe you can do an experiment of your own to determine what goes well with this tomato-y condiment! Thanks for visiting us today, Daisy, Griselda, and Emely! Great work! :)

  28. I call it ketchup. And I used to watch a show and they called it catsup.My brothers and I, just for fun sometimes call it catsup!

    • What a fun connection, Katybug3000! We love learning about cool nicknames, even if it’s for a TV show! It sounds like you and your brothers are a creative bunch! Thanks for sharing your comment today! :)

    • You’re not alone, Cristian! So many of us here at Wonderopolis have had a taste for french fries with a side of ketchup ALL DAY LONG! Thanks for sharing your prediction for tomorrow’s wild Wonder! :)

  29. You have great information that makes us wonder!!!!!!!!! We have just begun to use your website! We are excited to see what is next. :)

    • Well thank you so much, Wonder Friends in Ms. Burns’ Class! We are very excited that you’re visiting us today– thanks for stopping by to say hello! We hope to Wonder with you again soon– have a WONDERful weekend! :)

    • Thanks for sharing your comments, Destiny! Hello to you! We hope you’ll check out our Wonder What’s Next section and share your guess! :)

    • How cool, you learned something new with us, Wonder Friend Adrianna! We are so glad you shared your comment! Have a fun and WONDERful day! :)

    • Well that’s great news, Wonder Friend Shanyla! Thank you so very much for telling us how much you enjoy Wonderopolis! HOORAY for you! :)

  30. I LOVE this video! I keep watching it over and over! My brothers love it too. :) I just like to call it ketchup. ;) My big sister HATES ketchup. :) Thanks for the wonder! :) :) :) :)

    • It sounds like you’ve been WONDERing all about ketchup, its history, and how your family feels about it, Blakeleigh! GREAT WORK! We are glad you have been WONDERing with us… you’re a great storyteller! :)

  31. I think the wonder of the day was cool and I think tomorrow’s wonder will be about food. Hi Mrs. Tomkins if you read this thank you.

    • Hey there, Wonder Friend Kaleasha! We are so very glad that you’re here today and you’ve been WONDERing with us about ketchup! It sounds like Mrs. Tompkins is pretty great– we’re glad you said hello to her, too! Have a SUPER day, Wonder Friend! Thank you for sharing your awesome prediction! :)

    • That’s awesome, Wonder Friend Daniel! Surf’s up– we Wonder if you have ever tried surfing? It seems like a fun but tough sport! Lots of time in the water! :)

    • That’s great news, Wonder Friend Caleb! We are so glad to hear that you’ve been WONDERing with us today! Have a SUPER Saturday– we look forward to seeing you again! :)

    • This Wonder video made us chuckle, too, Wonder Friend Daniel! Thank you for sharing your comment and telling us all about your favorite part of our Wonder! :)

  32. We have both seen it used both ways. We have seen it used “Catsup” in Garfield comics. We don’t know if that is intentional because “cat”sup and Garfield is a cat. We have also asked our parents and they said either one is fine.

    • Thank you so much for WONDERing with us, Craig and Winner! We are happy to know that you’ve thought of times you’ve seen catsup used, and you even asked your parents for their thoughts, too! We are so glad you’re here and we look forward to WONDERing with you again soon! :)

  33. What We Learned:
    We learned that ketchup had many different names in the past. Ketchup has many ingredients including: Onion, sugar, salt, garlic, cinnamon, celery, vinegar, cloves, and pepper.

    What We Think:
    We found it interesting that ketchup has been around for so long that it existed in the 17th century. We wonder why it is still called catsup in some places.

    • You’ve shared so many great thoughts and questions, Wonder Friends Shubha and Cate– thanks for visiting Wonderopolis today! Ketchup has lots of ingredients found in other sauces and spices! We think it is cool to Wonder about kings and queens from the 17th century using the same ketchup we eat today! :)

  34. What We Learned:
    1. Ketchup was once a pickled fish sauce in China.
    2. The Europeans brought the sauce with them in the 17th century.
    3. Catsup came from a poem written by Jonathon Swift in 1730.
    4. About 70 years later, the recipe for ketchup changed to the ketchup we know today.

    1. We were surprised that ketchup was a fish sauce in China.
    2. We didn’t know that it was made a long long time ago. :D

    • Great work, Ha Ryn and Zoe, we really enjoyed reading about what you learned from our ketchup Wonder! Thanks for telling us about the cool new things you found out about ketchup– who knew it was such a popular and old sauce?! :)

    • We are so glad you enjoyed our Wonder video all about ketchup (or catsup), Tabitha! We can’t take credit for the beautiful and funny video, because we did not create it. There are so many WONDERful videos available online that we like to share others Wonder Friends’ work here at Wonderopolis, just like this video! Thanks for visiting us today! :)

  35. Dear wonderopolis
    I love your videos I think they’re very funny and my friends think this video is very funny and keep up the good work!

    • Well thank you so very much, Wonder Friend Abby! We’re so glad to know that you’ve been chuckling with us today! :)

    • YUM! That sounds delicious to us, Wonder Friend Hunter! It sounds like you like ketchup as much as some of us here at Wonderopolis! :)

    • Thank you for sharing your comment, Darthscifigeek! We Wonder what your like to eat with ketchup? Fries, burgers, hot dogs? :)

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Have you ever wondered…

  • Is it catsup or ketchup?
  • How long has ketchup been around?
  • Can you make homemade ketchup?

Wonder Gallery

929Vimeo Video

Try It Out

Do you like ketchup? Or do you prefer catsup? Or does it really matter as long as you have that red, sweet, tangy sauce to put on your French fries? Enjoy extending your learning about ketchup — or catsup! — as you check out one or more of the following activities with a friend or family member:

  • Field trip time! Ask an adult to take you to a grocery store to check out the wide variety of ketchup on the shelves. Look through the bottles. Do you see both ketchup and catsup? Or is it just one or the other? Other than size and price, how do the varieties of ketchup differ? Do certain brands claim to taste better or have special ingredients? Pick out a bottle or two of ketchup to purchase and take home with you. You’ll need it for the next activity!
  • Get a bottle of ketchup out of your refrigerator, or open one or more of the bottle you bought at the store recently. Do your own blind taste test. Get some French fries or hot dogs and try them with different kinds of ketchup. Which brand do you prefer? Check out the labels on the different bottles. How healthy is ketchup? What ingredients are included? How many calories are in a single serving? How big is that serving? How much sugar is in your bottle of ketchup? Have fun learning more about one of the best condiments out there!
  • Up for a challenge? If your home is like most homes in America, you probably have at least one bottle of ketchup — or catsup — in the refrigerator. Did you know you can make your own homemade ketchup, though? It’s true! Grab a friend or family member and check out the recipes below. Choose one to try and then check the list of ingredients in case you need to go to the store for a few supplies before you head to the kitchen to concoct your own homemade condiment!

Still Wondering

In Science NetLinks’ Tomato Mold Science Update, you’ll hear about a researcher who’s helping tomato plants fight back against black mold, a fungus that destroys them.

Wonder What’s Next?

Tomorrow’s wet and wild Wonder of the Day is totally rad!

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