What has 13 hearts but no other organs?

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

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

If your uncle’s sister is not your aunt, what relation is she to you?

I have 50 feet long of cloth, I need to create 50 handkerchiefs each size of 1 foot. I take one minute to cut a 1-foot handkerchief. So how long will it take to cut 50 handkerchiefs?

what does the below rebus mean?

It has five wheels, though often think four, You cannot use it without that one more, You can put things in it, you can strap things on top, You can't find it in the market, but you can still go shop. What is it?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

You see me once in June, twice in November, and not at all in May. What am I?