What happened when the wheel was invented?

Can you write down eight eights so that they add up to one thousand?

What does this rebus mean?

O
N
C
E
TIME

Can you identify the famous TV character from the rebus below?

A man is found dead in his bathroom naked with blood scattered all around him. The bathroom was locked from the inside and there is no trace of any struggle. There is nothing in the bathroom except his pant with the belt still around and his shirt. Also, the medic team can't find any incision in his body that may have been the reason behind so much blood loss.

The Police department is clueless regarding this murder mystery.
Can you?

How can you take 2 from 5 and leave 4?

Look at the picture and find out which square is not linked with any of the other squares.

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

What is the centre of gravity?

Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?