Brain Teasers 5

Teaser 1: How can you drop a raw egg onto a concrete floor without cracking it?

Teaser 2: If it took eight men ten hours to build a wall, how long would it take four men to build it?

Teaser 3: If you had three apples and four oranges in one hand and four apples and three oranges in the other hand, what would you have?

Teaser 4: How can you lift an elephant with one hand?

Teaser 5: How can a man go eight days without sleep?