I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

In four steps you need to move the word 'cold' From 'warm' by replacing one alphabet at a time such that every word formed at each step is acceptable in English Dictionary.

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?

What is the riddle which can be asked all day with a different correct answer each time.

Why 1729 is a magic number? Answer Logically.

I hide my treasure in the ground, my tail is big and fluffy. If you spot me in a tree, please don’t call me scruffy. What am I?

Can you spot what's wrong with the following sentence?

PETER WAS ANGRY AT
HIMSELF BECAUSE HE
ACCIDENTALLY LEFT THE
THE KEYS TO HIS CAR
AT HIS FRIEND'S HOUSE.

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

What jumps when it walks and sits when it stands?