What has 13 hearts but no other organs?

You walk into a creepy house by yourself. There is no electricity, plumbing, or ventilation. Inside you notice 3 doors with numbers on them. Once you open the doors you will die a particular way. Door No.1 You’ll be eaten by a lion who is hungry. Door No.2 You’ll be stabbed to death. Door No.3 There is an electric chair waiting for you. Which door do you pick?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

In the image given, you can find several triangles. Can you count them all?

What is the word or phrase?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

Why 1729 is a magic number? Answer Logically.

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

Prove that the below maths equation is true.

8 + 8 = 91

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?