How can one talk without saying a single word?

What jumps when it walks and sits when it stands?

What can you deduce from the following BrainBat?

CRY
LMKI

How many minutes are there in Feb 2017?

Note: The shortest answer is the correct answer.

Find three numbers such that When we multiply three numbers, we will get the prime numbers. The difference between the second and the first number is equal to the third and second.

Name a key which is hardest to turn.

13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

I am lying and I always lie. Tell me whether I am lying or telling the truth.

Here is what you have to do. You have to throw a ball as hard as you can but it must return back to you even if it does not bounce at anything. Also, you have nothing attached to the ball. There is no one on the other end to catch that ball and throw it back at you.

How will you do it?