What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

2, 3, 5, 9, 17, _ What is the next number in the sequence?

What am I?

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?

A boy and his father are caught in a traffic accident, and the father dies. Immediately the boy is rushed to a hospital, suffering from injuries. But the attending surgeon at the hospital, upon seeing the boy, says 'I cannot operate. This boy is my son.' How is this situation explained?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

Solve the mathematical equation in the picture below.