What has hands, but can’t clap?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

Find the next number in the series.
1 10 24 43 67 ?

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

In a football game, Christina defeated Teresa by 2 - 0 but no man from either side scored. How can this be possible?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

How many times can you subtract the number two from the number fifty?

If you drop a 15 kg iron bar and a 5 kg bag of cotton from a height of 50 meters which will reach the ground first?

How many minutes are there in Feb 2017?

Note: The shortest answer is the correct answer.

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.