An Israeli inventor has invented a device that allows people to breathe underwater without oxygen tanks. His invention uses the air that is dissolved in water, just like fish.

The invention uses a centrifuge to lower pressure in part of a small amount of seawater taken into the system and dissolved gas is extracted.

Specifically, the invention has an inlet for extracting a quantity of water from the body of water. The invention includes a separator for separating the dissolved air from the quantity of water, thereby obtaining the breathable air. The invention has an outlet for expelling the separated water back into the body of water, and a second outlet for removing the breathable air and supplying it for breathing. The air is supplied so as to enable it to be expelled back into the body of water after it has been breathed.

The system uses the “Henry Law” which states that the amount of gas that can be dissolved in a liquid is proportional to the pressure on the liquid. As you raise the pressure, more gas can be dissolved in the liquid. As you decrease the pressure, gas is dissolved in the liquid releases the gas.

Researchers at Dartmouth University have developed a microrobot measuring about 60 micrometers wide by 250 micrometers long. That’s about the width of a human hair. That makes it the smallest robot ever created.

The robot is ten times smaller in length than previous microrobots. Amazingly the microrobot is controllable in that you can direct it anywhere on a flat surface. The microrobot can move freely across a surface unrestricted without wires or rails. Another feature previous generations of microrobots were incapable of performing.

The microrobot actually crawls like a worm, making tens of thousands of 10-nanometer steps every second. The microrobot turns by pivoting about a single foot.