What goes up but never comes down?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

What is the longest word in the dictionary?

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:

Consider this about a word: The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?

Can you name four days which start with the letter 'T'?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

If,

A + B = C
D - C = A
E - B = C

Based on the above equations, find out the answer for:

D + F = ?

Give it food and it will live; give it water and it will die.

Remove two matchsticks to make the below equation correct.