Why is 6 afraid of 7?

One absent-minded ancient philosopher forgot to wind up his only clock in the house. He had no radio, TV, telephone, internet, or any other means for telling time. So he travelled on foot to his friend's place a few miles down the straight desert road. He stayed at his friend's house for the night and when he came back home, he knew how to set his clock. How did he know?

Only one colour, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

What does this rebus riddle means ?

What has to be broken before you can use it?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

A blonde put eyeliner on her head. Why?

John can place six large boxes or nine small boxes into a carton.

Can you find out in how many cartons can he place sixty-six boxes in total?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

Count the number of triangles in the given picture.