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

A bank customer had $100 in his account. He then made 6 withdrawals. He kept a record of these withdrawals, and the balance remaining in the account, as follows:

Withdrawals Balance left
$50 $50
$25 $25
$10 $15
$8 $7
$5 $2
$2 $0
----- -----
$100 $99

Why are the Totals not tallying?

Buy me, smell me or deliver me, I do not change.

Who am I?

People put me on the table and cut me but do not eat me. What am I?

What is the next number in this matchsticks series riddle?

When 99 is considered higher than 100?

One absent-minded ancient philosopher forgot to wind up his only clock in the house. He had no radio, TV, telephone, internet, or any other means for telling time. So he travelled on foot to his friend's place a few miles down the straight desert road. He stayed at his friend's house for the night and when he came back home, he knew how to set his clock. How did he know?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

In a secret society, a buried chamber can be accessed only via a secret password. The password is seven characters long and comprises of just letters and numbers.

You find a code that can help you in cracking the password. The code says "You force heaven to be empty".

Can you deduce the password from that?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100