What Adam and Eve do not have but the rest of the people have?

Solve the mathematical equation in the picture below.

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

Which is faster, Heat or Cold ? Explain.

A generous owner of a company decided to give a bonus of $45 to every man and $60 to every woman on his birthday. But only one-ninth of the men and one-twelfth of the women were present to take the bonus.

Can you calculate the amount of money the owner spent if there were 3552 employees?

The more it dries, the wetter it becomes. Can you tell what it is?

Suppose we lay down two cups in front of you. One of the cups is filled with tea and the other one with coffee. Now we ask you to take a spoonful of tea and mix it with the coffee. At this moment, the coffee cup has a mixture of tea and coffee. You have to take that mixture (spoonful) and add it back to the tea.

Can you now tell if the cup of coffee has more tea or the cup of tea has more coffee?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

Prove that the below maths equation is true.

8 + 8 = 91

John has played 50 ODI's and his average is 50. How many runs should he score in his 51st ODI, so that his average score jumps to 51?