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

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

What can jump higher than a building?

A professor thinks of two consecutive numbers between 1 and 10.
'A' knows the 1st number and 'B' knows the second number

A: I do not know your number.
B: Nor do I know your number.
A: Now I know.

What are the four solutions for this?

What has 13 hearts but no other organs?

Detective Rockford was jogging near the beach at 4:30 am.
He hears a sound near the shack "No Michael, Please Do not shoot me".
Next instance he heard the sound of gunfire. Rockford rushes to the shack where he finds women lying dead and a gun in close proximity of three "Doctore Lawyer and a Teacher".

Rockford immediately knew that the Lawyer has committed the crime. How?

What number should come in place of the question mark below?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?