Can you convert the number zero(0) into a positive number using just one mathematical operator ?

There is a place where if I stand up straight, I will still be considered sideways.

Two friends were betting. One said to the other, "The coin will be flipped twenty times and each time the coin lands on the head, I will give you $2 and each time it lands on the tale, you will give me $3." After flipping the coin twenty times not a single penny was exchanged among them.

How many times did the coin land on heads?

If 1+9+8=1, what is 2+8+9?

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

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

There are three Athletes (John, Tarun and Harish) and their individual Coaches (Jacob, Meenaxi and Priyanka) standing on the shore.
No Coach trusts their Athlete to be near any other Coach unless they are also with them.
There is a boat that can hold a maximum of two persons.
How can the six people get across the river?

Known by all without exception, Forever here, for your protection, Sometimes strong, sometimes weak, Right after the night I come - hot and chic. And while millions of miles away, I always get to you, I find my way. No life around could do without me, Can you guess what I might be?

Be active and find the killer in the picture Riddle below.

Keyboard words are not in alphabetical order, Why?