optical mouse

 Optical mouse is a popular mouse in the world.
Optical mouse sense movement on the floor.

Optical mouse capture pictures and compare them.

Myeonje baegab

Myeonge baegab is first bulletproof vest in the world.
Myeonge baegab invited in Joseon.
1871 It used in battle during in invasion of Korea by the U.S.
Myeonge baegab was burnt easily but it can prevent bullet.

It made of more than 13 layers of cotton.

Maple

Most maples are growing to 10 – 45 meters  in height.
Most species are deciduous.
Maples are important source of syrup and wood. It often used by smoking food.
Sugar maples are used to sap. Maple sap boiled and made in to syrup or sugar.
Maple are coat of arms of Canada. Maple is on the Canada flag.

Shoebill

The shoebill is a very lage bird. Adult bird is 115-150 cm tall.
Their beaks have an average length of 30 cm.
Shoebill have a big break in the world.

Ozone hole

Ozone hole protect the from ultraviolet ray. Freon gas and ritrogen monoxide are caused of ozone hole. Ultraviolet ray had impact on human body and small animal.

Aractic ozone hole discovered in 2011. Ozone hole is recovering now.

Brain chip

Samsung applied for a pantent brain chip in the United States.
Samsung used for administer a mechanical heart, movement and vaccine right now.
They think about developge chip.