Why is it very easy to weigh a fish?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

Which is the correct shadow of the bird?

Can you identify the hidden rebus in the image below?

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?

How can one talk without saying a single word?

You have to fill the below given grid in a manner that every row and column contains the digits 1 to 6. Also, make sure that the squares that are connected with each other must contains the same digit.

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?