Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

Find the missing number in the series below

13 -21 34 -55 ? -144

A father's child, a mother's child, yet no one's son.

Who am I?

What has no start, end, or centre?

Which is heavier: a ton of bricks or a ton of feathers?

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

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?

I’m orange, I wear a green hat and I sound like a parrot. What am I?

Birbal was jester, counsellor, and fool to the great Moghul emperor, Akbar.
The villagers loved to talk of Birbal's wisdom and cleverness,
and the emperor loved to try to outsmart him.
One day Akbar (emperor) drew a line across the floor.
"Birbal," he ordered, "you must make this line shorter, but you cannot erase any bit of it."
Everyone present thought the emperor had finally outsmarted Birbal.
It was clearly an impossible task.
Yet within moments the emperor and everyone else present had to agree that Birbal had made the line shorter without erasing any of it.
How could this be?

In case you were starting to feel confident, this one was meant for third graders in Vietnam. The answer is 66, but we don't blame you for scratching your head about how they got there.