Do you know how spit works or why you get stinky feet?
In America, kids are learning the answers to questions like these in school as part of 'grossology' lessons.
Grossology teacher Sylvia Branzei
A biology teacher called Sylvia Branzei invented grossology to make her subject more fun for children.
She said: "If I go into class and ask 'Who wants to learn about the excretory system?', no one moves.
"But if I say 'Raise your hand if you want to learn about spitting, burping and weeing', everyone raises their hands."
So how gross is it?!
Fact File
Gross facts
Humans swallow a litre of saliva and mucus each day
There are more than one million tiny creatures in our mouths
Penguins feed their young by vomiting food in their mouths
A dog's mouth is cleaner than a humans
In a grossology lesson, children find out how spit works by chewing up a biscuit, spitting it out, and seeing how the saliva breaks it down.
They also make fake blood and learn why bacteria makes people burp.
At the moment, Sylvia has no plans to export grossology to the UK - but if you really want to try it out, a series of books, called Horrible Science, tackles science in a similar way.
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