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

What does a man do only once in his lifetime, but women do once a year after they are 29?

Three people enter a room and have a green or blue hat placed on their heads. They cannot see their own hat but can see the other hats.
The colour of each hat is purely random. They could all be green, blue, or any combination of green and blue.
They need to guess their own hat colour by writing it on a piece of paper, or they can write 'pass'.
They cannot communicate with each other in any way once the game starts. But they can have a strategy meeting before the game.
If at least one of them guesses correctly they win $10,000 each, but if anyone guesses incorrectly they all get nothing.
What is the best strategy?

The owner of a popular clothing store comes up with his own method of pricing items. A vest costs $8, socks cost $10, a tie costs $6, and a blouse costs $12. Using the owner’s method, how much would a pair of underwear cost?

Can you identify the hidden rebus in the image below?

Identify the 10 differences between the two given pictures.

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

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

A man was going to bleach his socks because they had gotten muddy the day before. As he was pouring the bleach into the washing machine, he spilt some on the floor. He got some cleaning fluid and mopped it up with a rag. Minutes later he was dead. What killed him?