In return, an Arizona water-user (say, the city of Tucson) pumps the same amount of Nevada's water out of the aquifer under Arizona.

ECONOMIST: Water in the West: Buying a gulp of the Colorado | The

At the local level, water-user associations responsible for the management and maintenance of irrigation canals have been set up with foreign help.

ECONOMIST: The heavy costs of non-co-operation

Part of the problem has been that, whereas water west of the Mississippi belongs to the user, who can sell or barter it (see article), water to the east is generally public property.

ECONOMIST: Water, water, everywhere

The new rules also say that products claiming water resistance must say how long a user can expect to get that protection while swimming or sweating, either 40 minutes or 80 minutes.

WSJ: Sunscreen Each Day Stops Wrinkles

As a user of tens of billions of gallons of water in its food and beverage operations globally, including in many nations facing water shortages, PepsiCo has recently adopted a water policy dedicated to fulfilling the human right to water as defined by the United Nations.

FORBES: 'Pepsi Refresh' Is Not PepsiCo's True CSR Effort

Electric power companies were by far the largest user, withdrawing 86.4 million gallons of water per day in 2010, and 92.7 million gallons per day in 2012.

WSJ: Susquehanna River commission wants gauge funding

While the biggest user is power generation, with 49% of all water use.

FORBES: To Conserve Energy - Conserve Water

It seeks a toilet that costs less than five cents per user per day to operate, that requires neither a supply of clean water nor sewerage infrastructure to take the waste away, and that will generate energy and recover salts, water and other nutrients.

ECONOMIST: Monitor: Flushed with pride | The

There are lots of small initiatives, either at the user end -- e.g. turning off stand-by switches, drinking tap water -- or the supply end -- e.g. wind energy, tidal energy.

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As an example, if a user draws a "W" on the dimmer, a signal could be sent to an IP connected water sprinkling system to turn on or off the sprinkler.

ENGADGET: Ube WiFi Smart Dimmer to receive customized multitouch gesture control

The statistic that blew me away the most was that the average registered user connected to Napster once every other day (this is of course now completely blown out of the water by Facebook, but for the year 2000 this was astounding).

FORBES: What Was It Like To Work At The Old Napster?