What breaks yet never falls, and what falls yet never breaks?

Chef Andrea has to light the kitchen stoves to open her restaurant for the day. There are three stoves in the kitchen: A glass stove, a brick stove, and a wood stove. She only has one match. Which does she light up first?

In two decks of cards, what is the least amount of cards you must take to be *guaranteed* at least one four-of-a-kind?

A lion and its tamer are standing inside a cage that measures 1 unit in radius. Both of them can effortlessly run at the speed of 1 unit maximum.

1) Suppose the lion is hungry, will he be able to eat up the tamer?
2) If yes, how long can the tamer survive?

I’m tall when I’m young, and I’m short when I’m old. What am I?

John was drowned by he was not wet. How?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

Why do we preferably have round manhole covers and not square ones?

A girl is twice as old as her brother and half as old as her father. In 50 years, her brother will be half as old as his father. How old is the daughter now?