They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

The dirtier I get, the whiter I look. Who am I?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

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.

Why 1729 is a magic number? Answer Logically.

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

What Word am I Looking For ?

How many sides does a circle have?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

1 rabbit saw 9 elephants while going to the river. Every elephant saw 3 monkeys going toward the river. Each monkey had 1 parrot in each hand. How many animals are going towards the river?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?