Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

Two boys were admitted to a school. When the headmaster asks them about their parents, they tell him that they have same parents (father and mother). On further inquiry, it turns out that they both share the same date for their birthday.

"Are you twins," ask the headmaster.
"No," replies the boys.

Is it possible?

You walk into a creepy house by yourself. There is no electricity, plumbing, or ventilation. Inside you notice 3 doors with numbers on them. Once you open the doors you will die a particular way. Door No.1 You’ll be eaten by a lion who is hungry. Door No.2 You’ll be stabbed to death. Door No.3 There is an electric chair waiting for you. Which door do you pick?

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?

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?

I travel all around the world but always stay in the corner. What am I?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?