99% Invisible

Dear Hank and John and Roman (2022x484)

:

So why don't we have mouth Roombas? Is the universe full of chickens? what scientific advances are happening? What was the first Internet purchase? How do I convince my parents to let me check a bag? What is Twitter? What's the difference between a telescope and a camera? Are sea monkeys natural? Hank Green and Roman Mars have answers!