How can a man go eight days without sleep?

In one of the popular batman series movie "Batman Forever", there was a riddle that goes like "Tear me off and then scratch my head and I was red then and now I am back. Who am I?

Consider this about a word: The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

Kareena is older than Katrina and younger than Karishma. Isabelle is younger than Bipasha and Karishma. Bipasha is older than Karishma. If Kareena and Isabelle are the same age, who's the youngest?

A lion and its tamer are standing inside a cage that measures 1 unit in radius. Both of them can effortlessly run at the speed of 1 unit maximum.

1) Suppose the lion is hungry, will he be able to eat up the tamer?
2) If yes, how long can the tamer survive?

I’m tall when I’m young, and I’m short when I’m old. What am I?

You can see three almost identical images below. Can you spot the odd one out from them?

Count the number of triangles in the given picture.

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?