What four weights can be used to balance from 1 to 30 pounds?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

Imagine a box with two cogwheels, one big with 24 teeth and one small with 8 teeth. The big one is firmly attached to the center of the box which means it does not turn or move while the small one rotates around the big one.

How many times do you think that the smaller wheel will turn compared to the box when it turns once around the big one?

James bond was pushed out of an aeroplane without any parachute.
He survived, How come?

The more you take me, the more you leave me behind.
Who Am I?

I travel all around the world but always stay in the corner. What am I?

What is more useful when it is broken?

What goes up but never comes down?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

What is the word or phrase?