What is the below Rebus indicate?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

First, think of the colour of clouds. Next think the colour of snow. Last, think of the colour of the moon. Now, what do cows drink?

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?

Can you discover the missing number in this series?

37, 10, 82
29, 11, 47
96, 15, 87
42, ?, 15

What time is it when an elephant sits on a fence?