What has 13 hearts but no other organs?

I look at you, you look at me, I raise my right, you raise your left. What am I?

I am a five-letter word and comprises two different vowels and three same consonants. I am so strong that I can spoil your entire work.

Can you find out who am I?

Different lights make me strange by changing me into different sizes. What am I?

Can you find the least possible number such that

If the number is divided by 3, it gives the remainder of 1;
If the number is divided by 4, it gives the remainder of 2;
If the number is divided by 5, it gives the remainder of 3;
If the number is divided by 6, it gives the remainder of 4.

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

If I put in one canary per cage, I have one bird too many. If I put in two canaries per cage, I have one cage too many. How many cages and canaries do I have?

Find the hidden panda in the image below.

Find the next number in the sequence

5 12 24 36 ?

Can you place three balls such that the equation shown in the picture holds true?