How can you make number one disappear by adding something to it?

A doctor and a boy were fishing. The boy was the doctor’s son, but the doctor was not the boy’s father. Who was the doctor?

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 is so fragile that saying its name breaks it?

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

Can it be possible to build a house that has all its four walls facing towards the South?

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

Which Travels Faster? Solve below famous picture riddle:

What does man love more than life, and hate more than death or mortal strife; that which satisfied men want; the poor have, and the rich require; the miser spends, the spendthrift saves, and all men carry to their graves?

Rectify the following equality 101 - 102 = 1 by moving just one digit.