What is black when you buy it, red when you use it, and gray when you throw it away?

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

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

By moving just one matchstick, you need to make the below statement true. Can you do it?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

There was a minor accident with a doctor's son but the doctor noticed no major injury. After the treatment, the father of that doctors son is sitting with the son of the doctor without the doctor being in the room.

How can this be possible?

Can you divide numbers from 1 to 9 (1 2 3 4 5 6 7 8 9) into two groups so that the sum of the numbers of each group is equal?

Note: 9 cannot be turned over to make it 6.

The cream is heavier than Milk. True or False?

Take away the whole and some still remain. What is it?

Why is the longest human nose just 11 inches?