How to levitate objects without strings,tapes or magnets.

Levitation isn't just for mystics anymore. DRS Presents has demonstrated airflow levitation of objects. A simple hair-dryer becomes a magical levitation device through an understanding of the principles of fluid flow.
Watch the video:

Perpetual Motion Machines

Perpetual motion machine is a device that operates continuously without any external source of energy. This kind of machine is considered as impossible.

Following video shows some attempts to make perpetual motion machines. But it can be shown that these machines take energy from the gravity (potential energy) of the earth. (Similar to an object that is falling from above which takes the energy from the gravity of earth)

How to win 2048 game (without undo button).

          As shown in the figure, always keep the largest tile at the corner and then fill the other tiles in descending order as shown by the arrows. The following video shows how I reached the 131072 tile. (Without undo button)

How to Play 2048 Video: