In geometry, what is a tesseract?

Thank you, MCU ;)

I first heard that word in the wonderful children 's book, a Wrinkle in Time. They explained the concept with a string, so I guessed wrong. 😟

qua la gioi may tinh

I guess Marvel's Avengers did teach something.

RandalD, Much of my brain seems to operate in the 4th dimension

I love math questions!! when I go back to college, its one subject I am taking and Psychology!!