watering

Use your cell phone to detect mercury levels in water

It may not make your list of must-have camping gear, but a new sheet that detects mercury levels in water may prove useful to those who live or work downstream from industrial and mining sites (such as gold mines and coal-fired powered plants) and want to drink the local water.

When dipped in water for five minutes, the sheet, manufactured by chemists at the University of Burgos in Spain, signals the presence of mercury by turning red -- a process that can be seen with the naked eye.

Take a picture of that sheet with a digital camera, and you can learn the specific concentration of the mercury, a metal that is liquid at room temperature and has been found to cause long-term neurological issues after accumulating in the brain.… Read more

Stay connected with your Zuvo Stratus kitchen faucet

Water is easy to take for granted. It comes out of the faucet, we collect it in a glass, and drink it to quench our thirst. But there is more to it than that, of course. Bottled water, filter pitchers, and other countertop systems have proliferated over recent years, all in an effort to make water taste and smell better to us, not to mention making it safer to drink. Now, it can communicate with us -- well, almost.

There is a lot of information hidden in the everyday stream of water that pours out of our kitchen faucets. The … Read more

Simple puzzler gets challenging quickly as gameboards get bigger

Flow Free: Bridges is an easy-to-learn puzzler with satisfying touch-screen controls, but be ready for a challenge once you hit later levels.

Many people will remember Web-based pipe games where you connect pipes to complete a circuit so water can flow from a starting point to a goal. Flow Free: Bridges is a similar concept, but instead you're trying to connect multiple color-coded start and end points together without crossing the lines. Fortunately, there is an exception to the rule about crossing the lines, with bridge tiles you can make one pipe pass over another to get to the … Read more

Observe the science of a snowflake

You might agree that the complex design in a snowflake appears almost comparable to a work of art. Do you know how that tiny frozen masterpiece comes to life, though? If you're like me, you may never have witnessed a complete representation of that journey from cloud to ground before.

The trip isn't as simple as you think. … Read more

Mercury's north pole is probably chock full of ice

Disappointed about that hyped-up supposed Mars discovery that ended up evaporating? Turn your eyes toward Mercury.

A NASA news conference yesterday suggested what many scientists have suspected for decades: Mercury's northern pole most likely contains large deposits of water ice and possible organic materials. The new data comes from Messenger -- a NASA spacecraft currently orbiting Mercury -- which observed the icy deposits by measuring hydrogen concentrations on the planet. The findings were described in three separate papers published yesterday in the science journal Nature. … Read more

The Audiophiliac's top music tracks for testing speakers and headphones

Readers have from time to time requested a list of the "test" tracks I use to evaluate gear. It's a long list, mostly recordings I've used for many years and heard on hundreds of products, and recordings I made myself or from sessions I attended. They work for me, but wouldn't necessarily help you. More than any specific tracks, I recommend starting with music you know best, favorite tunes you've listened to for years, and then listen to how the speaker, headphones, etc., you're considering changes, improves, or degrades the sound of your … Read more

DARPA's massive water tank loves tough terrain

When the going gets tough, the Defense Advanced Research Projects Agency creates a vehicle -- capable of driving on water, land, and even deep mud -- to keep things going.

Officially known as the captive air amphibious transporter (CAAT), this water wagon currently under development looks like the strange lovechild of a tank and a hovercraft. CAAT could one day serve as an invaluable tool for the U.S. military when it delivers supplies to the coasts of disaster-stricken areas. … Read more

Episode 6: The most extreme torture test yet

This is the week that the torture test really comes into its own, I think. We decided to toughen up and test the brand-new 11-inch Apple MacBook Air. Yeah, I know. Yikes. But I really want to test portable devices, and the Air is the epitome of portable, is it not?

We're down to a good rhythm with heat, cold, dropping, and water, and we're really trying to figure out how to make the wild card tests true to life. So, when three or four viewers tweeted me and told me they had put their MacBook Airs on … Read more

World's fastest camera detects elusive cancer cells

Modifications to the world's fastest camera are enabling the real-time identification of rare breast cancer cells in blood, with a record low false-positive rate of one cell in a million, according to new research out of UCLA.

"This technology can significantly reduce errors and costs in medical diagnosis," lead author Keisuke Goda, a UCLA program manager in electrical engineering and bioengineering, said in a school news release.

The team's approach could not only pave the way for earlier detection of cancer and monitoring of drug and radiation therapy but also prove useful in urine analysis, water … Read more