Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

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?

Only one colour, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

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

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

I have eight fingers and two thumbs but I do not live. What Am I?

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?

Can you place three balls such that the equation shown in the picture holds true?

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

As shown in the image, the nine Dogs are square fenced. By constructing just two square fences can you make sure that two Dogs cannot meet each other without crossing the fence?