Alright, y'all know the drill!
It's riddle time!! Woo!
Aight, same as last time, whoever guesses the answer right first gets to choose the topic of next chapter!
Here's the riddle:

What is it that given one, you'll have either two or none?

This one is a little bit harder than the last one so good luck!
And remember, don't cheat and search up the answer! I'm putting my trust in y'all not too cheat!