What word begins and ends with an E, but has only one letter?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

If your uncle’s sister is not your aunt, what relation is she to you?

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

I am the largest in my family of fifty.
The youngest of our family lives separately from the rest of the family and so do I.
I am regarded as harsh and tough.
I am so large, you cut me in two equal halves,
each half would still be larger than the second largest member of the family.
Who am I?

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

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

No one wants to have it, but if one got it, he does not want to lose it. What is It?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.