It is a Winter Olympics event. It is a key that will open many doors. You and your cat or dog each have one.

I’m not a flame, but I set the sky on fire. I’m not a curtain, but I close the day. What am I?

My first two is the name for a circle's fundamental ratio, my last two are the symbol for an element, used to make signs stand out at night. Together, I'm a synonym for yearn.

One part of my name is sour, the other has bite, I’m more social than ready to fight.

I come from an egg, yet the egg came before me.