How can one talk without saying a single word?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

There are 2 cops parked along a one-way street looking for traffic violations. They spot a taxi driver going in the wrong direction, yet they do nothing.

Why?

What do you get if you add 2 to 100 four times?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

John and Jenni are a married couple. They have two kids, one of them is a girl. Assume safely that the probability of each gender is 1/2.
What is the probability that the other kid is also a girl?

Hint: It is not 1/2 as you would first think.

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

He runs but never walks. Murmurs, but never talks. Has a bed, but never sleeps. And has a mouth, but never eats?