How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

What makes this number unique: 8,549,176,320?

Can You Find the Missing Zero? A Number Puzzle that Will Trick Your Eyes

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

Can you solve the below rebus?

Known by all without exception, Forever here, for your protection, Sometimes strong, sometimes weak, Right after the night I come - hot and chic. And while millions of miles away, I always get to you, I find my way. No life around could do without me, Can you guess what I might be?

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

You walk into a room and see a bed. On the bed, there are two dogs, five cats, a giraffe, six cows, and a goose. There are also three doves flying above the bed. How many legs are on the floor?

When monkey rotate the gear, which mark will be hit 1 or 2 ?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?