There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?

Can you identify if it's a murder or a suicide ?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

You can find some missing letters in the picture. By placing two particular letters in the spaces, you can form a nine lettered word beginning from one of the corners and going clockwise direction to the middle. Can you find out the letters and the word?

A sundial has the fewest moving parts of any timepiece. Which has the most?

If a shopkeeper can only place the weights on one side of the common balance. For example, if he has weights 1 and 3 then he can measure 1, 3 and 4 only. Now the question is how many minimum weights and names of the weights you will need to measure all weights from 1 to 1000? This is a fairly simple problem and very easy to prove also.

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?