what does the below math rebus puzzle mean?

Forwards I am heavy, backward I am not. What am I?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

Which Travels Faster? Solve below famous picture riddle:

What has one eye, but can’t see?

There are hundred red gems and hundred blue gems. The blue gems are priceless while the red gems equal wastage. You have two sacks one labeled Heads and the other Tails. You have to distribute the gems as you want in the two sacks. Then a coin will be flipped and you will be asked to pick up a gem randomly from the corresponding sacks.

How will you distribute the gems between the sacks so that the odds of picking a Blue gem are maximum?

Can you solve the photo plexer logic ?

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

There were five men at church, and it started raining while they were outside. The four that ran still got wet, but the one that was still stayed completely dry. Why did he stay dry?

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?