Good Riddles

Question: How can twins be born in different years?

Question: What is white and has black all over it?

Question: Nary a tick, nary a tock- silent, silent, the handless clock. Tarry no longer; cast off all doubt. The sands of time are running out.

Question: What is something you'll never see again?

Question: One falls but never breaks and the other breaks but never falls?

What are they?