It is always ahead of me yet I can never see it. What is it?

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?

What has 13 hearts but no other organs?

They are three errirs in this question. Can you find them?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

If we change the South-East direction into North and North-East into West and all others similarly.
Can you find out which direction will be in the place of South-West direction?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

What number do you get when you multiply all of the numbers on a telephone's number pad?

I have no life, but I can die. What am I?

A bag contains 64 balls of eight different colours. There are eight of each colour (including red). What is the least number you would have to pick, without looking, to be sure of selecting 3 red balls?