In this week's bonus segment Ask Tai Why, Tai takes questions from:

Charlotte, Toronto: What is fear, and why were we born with it?
Desmond: What is Time? 
George, Toronto: What makes colour a colour?

Why is space so dark if it’s full of stars?

Fifteen-year-old Tai Poole won’t rest until he’s uncovered the mysteries of the universe, one probing question at a time. In Season 4 of his Webby-winning podcast, Tai talks to everyone from NASA scientists to stand-up comedians to his equally curious little brother Kien. If you’ve ever wondered why nothing feels as good as a deep belly laugh or why it’s impossible not to finish a bag of Doritos, Tai has you covered.