What has 13 hearts but no other organs?

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?

what does the below rebus means?

There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?

In a jungle where there are no street lights or any other artificial source of lights, I notice a black snake crossing the road.
How did I get sight of the snake?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

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?

Which Travels Faster? Solve below famous picture riddle:

A maths symbol is hidden in the below Bar Graph. Can you decipher it?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?