What has hands, but can’t clap?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

How many times in a given day, minutes and hour clock comes in a straight line ?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

Which is faster, Heat or Cold ? Explain.

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

Find the Odd One Out?
84129
32418
47632
36119
67626
72927

The pound is not a finish.

We are sharing a few instructions below, which you have to use in any suitable order to modify the above sentence such that the end sentence is a scientific fact.

- Eliminate a letter and supplement another in its place.
- Take away one word.
- Remove one letter from one word.
- Get rid of two letters from one word.
- Swap a word with its antonym.

What is the longest word in the dictionary?

What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title