Why Do We Light Candles on Birthday Cakes?

1 Why Are There Boogers in the Nose?
2 Why Do We Burp and Fart?
3 Where Does Our Poo Go?
4 Why Are the Mosquito Bites Itchy?
5 Why Do We Have Scabs on Scars?
6 Why Does My Stomach Growl?
7 Why Do We Sweat?
8 Why Poo and Pee Smelly?
9 Why Do We Light Candles on Birthday Cakes?