If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

I make two people out of one. What am I?

Replace the (?) with the correct mathematical signs to make the expression equal to 59.

18 ? 12 ? 4 ? 5 = 59

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

What's the next in the series?

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