How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

What four weights can be used to balance from 1 to 30 pounds?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

I left my campsite and hiked south for 3 miles. Then I turned east and hiked for 3 miles. I then turned north and hiked for 3 miles, at which time I came upon a bear inside my tent eating my food! What colour was the bear?

Can you solve the below tricky visual equation?

Our product and our sum always give the same answer. Who are we?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

When it's bad luck to meet a black cat?

What has hands, but can’t clap?

An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?