What is always in front of you but can’t be seen?

Who can jump higher than a Mountain?

John and Jenni are a married couple. They have two kids, one of them is a girl. Assume safely that the probability of each gender is 1/2.
What is the probability that the other kid is also a girl?

Hint: It is not 1/2 as you would first think.

A father's child, a mother's child, yet no one's son.

Who am I?

What has one letter and starts with an E?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

I know a nine-letter word having only one vowel.
Do you ?

I have branches, but no fruit, trunk or leaves. What am I?

A famous swimmer can swim downstream in a lake in exactly 40 minutes with the lake current.
He can swim upstream in that lake in exactly 60 minutes against the lake current.
The length of the lake is 2 km.

How long he can cover the distance of one side at a still lake with no current?

You bought me for dinner but never eat me. What am I?