You have two buckets - one holds exactly 5 gallons and the other 3 gallons. How can you measure 4 gallons of water into the 5 gallon bucket?

(Assume you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.)

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?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

An American nightclub called 'The Coconut Grove' had a terrible fire in which over 400 people died. A simple design flaw in the building led to a high death toll. Subsequently, regulations were changed to ensure that all public buildings throughout the country eliminated this one detail, which proved deadly. What was it?

Can you find the six hidden animals in the picture below?

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

On my way to St. Ives I saw a man with 7 wives. Each wife had 7 sacks. Each sack had 7 cats. Each cat had 7 kittens. Kittens, cats, sacks, wives. How many were going to St. Ives?

There is a wide field of corn. A goose finds its way into the field and starts running. Can you find out till which point the goose can run into the field?