Wii

The Wii is a home video game console released by Nintendo on November 19, 2006. The Wii is Nintendo's fifth home console and the direct successor of the Nintendo GameCube. As a seventh generation console, the Wii primarily competes with Microsoft's Xbox 360 and Sony's PlayStation 3.

The console has a wireless controller, the Wii Remote, which can be used as a handheld pointing device and detects movement in three dimensions. The Wii Remote is also known as Wiimote and it has motion sensing capability, which allows the user to interact with and manipulate items on screen through the use of optical sensor technology. Another distinctive feature of the console is WiiConnect24, which enables the user to remain connected to the internet while the console is on standby.

 The Wii console contains 512 megabytes of internal flash memory and featured an SD card slot for external storage. An SD card can be used for uploading photos as well as backing up saved game data. The Wii has a PowerPC-based "Broadway" processor by IBM clocked at 729 MHz. The Wii console is backward compatible with all the official Nintendo GameCube's software, memory cards and controllers. There is also a microphone accessory which provides more realistic features to the Nintendo's Wii and is known as Wii Speak. It is connected to the console via USB. The device features an LED to indicate when the microphone is active.

Nintendo - Nintendo Co. Ltd. is a multinational corporation located in Kyoto, Japan. It was founded in 1889. It has developed into a video game company and is Japan's third most valuable listed company with a market value of over US$85 million.

Mario is the mascot of Nintendo. As Nintendo's mascot, Mario is said to be the most famous character in video game history. The appearance shown by Mario has been changed many times during the series. Another portable game console developed by Nintendo is the Nintendo 3DS, which was released on February 26, 2011. It competes with the Sony's PlayStation Portable and the newly released PlayStation Vita. 

What are tears made of ?

Tears play an important role in keeping us healthy. To clean and lubricate the eyes tears play an important role. Tears keep the surface of our eyeballs clean and moist, and help protect our eyes from damage. The production or shedding of tears is also known as Lacrimation or Lachrymation. Although they make appear to be nothing more than water, our tears are actually complex. Tears are made of mucus, water and oil. Mucus coats the surface of the eye and helps to bind the tear layer to the eye.

                                 
In the absence of healthy mucus layer, dry spots are formed on the cornea. The water is more of a saline solution that contains vitamins and minerals vital to normal cell function. The oil of the tears prevent evaporation of the tears. Some people do not make enough oil resulting in dry eyes. If the oil component is not normal then the tears evaporate too quickly.
Our tears also contain natural antibiotics called lysozymes. These antibiotics fight against bacteria and viruses.
Types of tears :


1. Basal tears -
These tears continually keep the cornea of the eyes wet and nourished. They lubricate the eyes and help to keep it clear from the dust. Usually in a 24-hour period, 0.75 to 1.1 grams of tears are produced and the rate decreases with age.

2. Reflex tears -
These tears result from the irritation of the eyes by the presence of irritant substances such as onion vapors, tear gas, pepper spray in the eye's environment. These are also linked with vomiting, coughing and yawning. These reflex tears attempt to wash out irritants that may have come into contact with the eye.

3. Psychic tears -
These tears are referred to as crying or weeping. These are produced due to strong emotional stress, anger, suffering or physical pain. The chemical composition of these tears is little different than those required for the lubrication.

Artificial tears -
Artificial tears are lubricant eye drops used to treat dryness and irritation caused by reduced tear production, as in case of dry eye syndrome. These are also used during medical examinations and to moisten contact eye lenses. These are produced to mimic the natural tears as closely as possible. They contain water, salts and polymers, but lack proteins which are found in natural tears.