A: It's a shape that's both a circle and a rectangle at the same time. Don't worry, it's not as confusing as it sounds.
A: They're not, but we're working on it. Seriously though, they're actually really important for understanding the intricacies of 3D printing.
A: Please do, they're a great way to express your creativity and challenge the very fabric of space and time.
Find out (just don't ask us to explain it, we're not experts).