I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

If you go to the movies and you're paying, is it cheaper to take one friend to the movies twice, or two friends to the movies at the same time?

A spaceship was lost. The detective was given a piece of paper. This was the location of the spaceship! This is what the slip had scribbled on it:
Juice, Umbrella, Potato, Ice, Tomato, Elephant, Rice.

Where is the spaceship?

What number when divided in half becomes zero?

What animal walks on four legs in the morning, two legs during the day, and three legs in the evening?

Oedipus, the king of Thebes, figured out the answer to the riddle:

How do you go from 98 to 720 using just one letter?

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

There is a certain crime, that if it is attempted, is punishable, but if it is committed, is not punishable. What is the crime?

What is black when you buy it, red when you use it, and gray when you throw it away?

What building has the most stories?