What has 13 hearts but no other organs?

By what process could you make a 'Tea-Table' into food?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

Can you replace the question mark with the correct number?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

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?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

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

If an earthquake is 1 point higher on the Richter Scale than another earthquake which is actually 10 times stronger, how much stronger would an earthquake be if it was just half a point higher on the Richter scale?