I shave every day, but my beard stays the same. What am I?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

Solve this tricky question. You are trapped in a forest. With you, you have a gun preloaded with two bullets in it. In front of you, there is a tiger, a leopard and a jaguar.

How do you survive?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

What has one letter and starts with an E?

I am first found in caves, now prolific online; I am a depiction, a drawing, a symbol, or sign. I will convey whichever mood you could wish; or for that matter, a fist, flask, or fish. What am I?

What's the next in the series?

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

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

Find the mistake in the below maths equations

A = 2
A(A-1) = 2(A-1)
A2-A = 2A-2
A2-2A = A-2
A(A-2) = A-2
A = 1

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?