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?
Replace all '*' with digits 1, 2, 3, 4, 5 and 6 to make below statement true.
* *
x *
=====
* * *
I shave every day, but my beard stays the same. What am I?
Find the missing number in the sequence below:
The more of this there is, the less you see. What is it?
What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?
Buy me, smell me or deliver me, I do not change.
Who am I?
A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?
What word is pronounced the same if you take away four of its five letters?
How many bananas can you eat if your stomach is empty?
If it took eight men ten hours to build a wall, how long would it take four men to build it?
In 2011, people playing Foldit, an online puzzle game about protein folding, resolved the structure of an enzyme that causes an Aids-like disease in monkeys. Researchers had been working on the problem for 13 years. The gamers solved it in three weeks.