illis Carrier, in full Willis Haviland Carrier   (born November 26, 1876, Angola, New York, U.S.—died October 7, 1950, New York City), American inventor and industrialist who formulated the basic theories of air conditioning. In 1902, while an engineer with the Buffalo Forge Company, Carrier designed the first system to control temperature and humidity. His “Rational Psychrometric Formulae,” introduced in a 1911 engineering paper, initiated scientific air-conditioning design. He was a founder (1915) of the Carrier Corporation, manufacturer of air-conditioning equipment.

Willis Carrier, an American engineer credited with inventing the first modern air conditioner. However, the idea of using evaporated water — or other liquids — to cool off a muggy space far precedes Carrier's 1902 invention.

The first known systems that used water to cool indoor spaces were created by the ancient Egyptians, who lowered the temperature in their homes by hanging wet mats over their doorways. The evaporated water from the wet mats reduced indoor air temperatures and added refreshing moisture to the dry desert air.

Not long after the Egyptians beat the heat with their doorway mats, the Romans developed a primitive air conditioning system by utilizing their famous aqueducts to circulate fresh water through indoor pipes, a method that significantly reduced the air temperature inside stuffy villas.

In 1758, American statesman and inventor Benjamin Franklin, along with John Hadley, a professor at Cambridge University, began experimenting with the refrigerating effects of certain liquids.

Willis Carrier of Buffalo, New York, devised the “dew point control,”

The first fully air-conditioned office building, the Milam Building in San Antonio, Texas, was constructed in the late 1920s.

highly efficient refrigerant gases of low toxicity known as Freons (carbon compounds containing fluorine and chlorine or bromine) in the early 1930s was an important step

The approach that most animal cells employ to regulate intracellular pH (pHi) is not too different conceptually from the way a sophisticated system might regulate the temperature of a house. Just as the heat capacity (C) of a house minimizer sudden temperature (T) shifts caused by acute cold and heat loads, the buffering power (β) of a cell minimizes sudden pHi shifts caused by acute acid and alkali loads. However, increasing C (or β) only minimizes T (or pHi) changes; it does not eliminate the changes, return T (or pHi) to normal, or shift steady-state T (or pHi). Whereas a house may have a furnace to raise T, a cell generally has more than one acid-extruding transporter (which exports acid and/or imports alkali) to raise pHi. Whereas an air conditioner lowers T, a cell generally has more than one acid-loading transporter to lower pHi. Just as a house might respond to graded decreases (or increases) in T by producing graded increases in heat (or cold) output, cells respond to graded decreases (or increases) in pHi with graded increases (or decreases) in acid-extrusion (or acid-loading) rate. Steady-state T (or pHi) can change only in response to a change in chronic cold (or acid) loading or chronic heat (or alkali) loading as produced, for example, by a change in environmental T (or pH) or a change in the kinetics of the furnace (or acid extrudes) or air conditioner (or acid loaders). Finally, just as a temperature-control system might benefit from environmental sensors that provide clues about cold and heat loading, at least some cells seem to have extracellular CO2 or extracellular HCO3 sensors that modulate acid-base transport.

Two suspects have been arrested and a third is sought in the thefts of more than 15 air conditioners, state police said.

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Air Conditioning Working Animation

Maintain suitable humidity in all parts of a building

Free the air from excessive humidity during certain seasons

Supply a constant and adequate supply of ventilation

Efficiently remove from the air micro-organisms, dust, soot, and other foreign bodies

Efficiently cool room air during certain seasons

Heat or help heat the rooms in winter

An apparatus that is not cost-prohibitive in purchase or maintenance

1882 - Thanks to Thomas Edison the first electric power plant opens in New York making it possible for the first time to have an inexpensive source of energy for residential and commercial buildings.

1906 - Willis Carrier patents his invention calling it an "Apparatus for Treating Air."

Attempts to control indoor temperatures began in ancient Rome, where wealthy citizens took advantage of the remarkable aqueduct system to circulate cool water through the walls of their homes. The emperor Elagabalus took things a step further in the third century, building a mountain of snow—imported from the mountains via donkey trains—in the garden next to his villa to keep cool during the summer. Marvelously inefficient, the effort presaged the spare-no-cost attitude behind our modern-day central air-conditioning systems. Even back then some scoffed at the concept of fighting heat with newfangled technologies. Seneca, the stoic philosopher, mocked the "skinny youths" who ate snow to keep cool rather than simply bearing the heat like a real Roman ought to.

Such luxuries disappeared during the Dark Ages, and large-scale air-conditioning efforts didn't resurface in the West until the 1800s

Hand fans were used in China as early as 3,000 years ago,

Mexico's Isla de las Muñecas (Island of the Dolls) is one of the most unnerving locales on Earth, a place where you are greeted by dirty, damaged baby dolls wherever you look. Take a video tour of this creeptastic island if you don't mind plastic infants popping up in your nightmares.

Isla de las Muñecas is a tiny island located in the canals of Xochimilco. The popular story of the island says that a young girl drowned off its coast roughly 50 years ago. The island's sole permanent inhabitant was hermit Don Julián Santana Barrera, who, shortly after the girl's death began finding dolls in the canal. He feared that these were a sign from an evil spirit, but believed that hanging the dolls on trees would direct him from evil spirits and the girl's ghost. Soon he began actively searching for dolls in the canals and the trash near the island and trading for dolls. He hanged them on trees and wires stretched between trees and kept some