It's true -- hunting down a waterproof MP3 player is a cinch, but finding a decent pair of waterproof headphones to accompany said player can prove challenging. Have a look at Melinda's question, and after you're done providing your best advice, send over an inquiry of your own to ask at engadget dawt com.

"I am an almost-daily lap swimmer, but lately I have been suffering from "lap boredom." I've been looking into the latest ways to take my MP3 player into the pool with me, and I need a set of waterproof headphones in order to do so. I've found waterproof earphones like H2O Audio and Aquatunes priced between $30 and $100, but I've also read many negative reviews. Before I spend this much money on waterproof 'phones, I want to know what I am getting. What brand / model do you recommend?"

Climb on out of the kiddie pool and toss in your advice, swimmers. What 'buds do you use to listen to music while submerged?

Sure we've seen glorified dehumidifiers like this before, but we're a sucker for any aquatic wonder which claims to solve the world's drinking water shortage. The exterior wall-mounted Watermill from Element Four is the latest "water from thin air" contraption and produces up to 3.2 gallons of water a day, pumped through a trusty ultraviolet sterilizer. But more importantly, it offers to hydrate your family of 6 (according to EF) for a mere thirty-five cents a day in power, not including whatever price Element Four decides to sell it for. Or you could just stick a bucket on your roof and be done with it -- we hear it rains occasionally.

[Via Gadget Review]

Hard to say if this solution will be cheaper than the bordering-on-free LifeStraw, but a team at the University of South Australia has developed a low-cost method for removing bacteria and other contaminants from water "using tiny particles of pure silica coated with an active nano-material." Professor Peter Majewski is pretty proud of the all new system, stating that it can "remove bacteria, chemicals, viruses and other contaminants from water much more effectively than conventional water purification methods." Due to its ability to function sans additional energy and its low overall cost, the team is hoping to see the creation bring clean water to developing countries. The best part? It should be available within two years.

[Via Protein OS]

Yep, just like we'd heard, the Phoenix lander has identified water in a soil sample it collected in Mars earlier, and NASA's extended the mission for another 90 days to go look for more. There's no analysis of the ice yet, but it doesn't look like there's any organic materials in the sample, and it'll take another three to four weeks before there's any more data to reveal. Hopefully that means we'll be packing up our silver go-go boots and taking off for our fabulous future lives on Mars in a month, but we'll see how things go.

It's only fitting that the glorious news of water ice on Mars was broke over Twitter this evening, via the Mars Phoenix lander's own first-person ramblings. Apparently Mars Phoenix was keeping an eye on some white patches it uncovered the other day, only to discover they'd disappeared today. According to the scientist folk over at NASA, that means those white patches must've been ice, which dissipated once uncovered. Now Mars Phoenix still has the considerable task of uncovering more ice and sampling it, but the mission is ahead of schedule and NASA has already identified a hard patch of ground it wants to dig into. Congrats to Mars Phoenix and all the fine folks at NASA, now be sure to watch out for the cave-dwelling little green men!

[Via Wired Science]

We've seen quite a few prototype fuel-cell powered mobile devices, but Samsung's upping the ante by predicting that we'll all be running our phones on water by 2010. The company says it's developed a method to generate hydrogen by exposing water to metal, but the details are a little shaky -- we're guessing it's similar to the system used in the HydroPak generator, but it's hard to tell. Still, we've got no reason to doubt Samsung's engineers, who say the system currently provides about 10 hours of use, or about five days of average cell usage, and will eventually allow users to simply top off and go. That's every traveler's dream -- let's get this to market, Sammy.

Finally, your mind-exploding, breakdown-inducing struggle to keep your houseplants watered regularly is getting a little help. A group called Botanicalls has come up with a method to monitor your plants remotely, then be Twittered when they need some water. Taking a slightly different direction than the ThirstyLight, the system is based around the popular (and versatile) Arduino board, which is combined with a DIY moisture sensor, and a small piece of code that will alert you when your greenery is starting to need a drink. Look, we'll be honest with you: it's a pretty complicated process to go through just to figure out when your plants need water, but if you're as serious about flora as we think you are, this will be a dream come true.

[Via Make]

Apparently, water is all the rage these days if you want to get a message seen. In Tokyo Bay Monster-fashion (sans holographic video monster), a designer named Julius Popp has created a system of displaying moving text and images using falling drops of water, thus creating a kind of virtual billboard that appears to be hovering in mid-air. The system -- called AquaScript -- works by utilizing magnet-valves which expel single drops of water on demand; proprietary software syncs the valves into a "freely definable bitmap-muster" which produces blocks of images with the falling liquid. Check the video after the break and see the wetworks in action.

Update: According to the flurry of activity in comments, Jeep has been up to these shenanigans for quite some time, though it appears they're using a system designed independently of this one... which kind of makes Mr. Popp's work just slightly less exciting. Thanks guys!

We've seen our fair share of diminutive power generators, but rather than worrying with vibrations or hyperventilating, Millennium Cell and Horizon Fuel Cell have teamed up to deliver an iteration that's water-activated. The pair has been working together on this technology for some time now, and apparently, it's readying a beta that will be demonstrated at next year's CES. The portable power generator incorporates a "unique water-activated cartridge system," which is designed to quietly provide clean energy to consumer products in emergencies and when far, far away from an electrical outlet. Reportedly, the device will provide an AC socket alongside two USB connectors, an operating time of over 16-hours, infinite shelf-storage life and 400-watts of instant juice by just adding H2O. Regrettably, we still have no idea what this thing actually looks like, but considering that CES is less than two months away, we'll soon be seeing what this $400 gizmo can do up close and in person.

Water purification is generally an energy-intensive, wasteful operation, but designers Alberto Medo and Francisco Gomez Paz have done a neat end-run around those problems with their Solar Bottle, a portable water bottle that purifies water using the sun. The bottle, which holds just over a gallon of water, uses a purification process called SODIS that takes six hours to kill off a whole host of baddies, including Oregon Trail favorites cholera, typhoid and dysentery. Just a concept for now, but the design has been well-received and won several awards, so hopefully someone will step up and take it into production soon.

[Via Inhabitat]

Apparently, Marine Current Turbines is having quite the time trying to install what would be "the world's largest tidal power project," as the installation that was slated to begin Monday will now be lucky to see completion this year. Dubbed SeaGen, the project will reportedly utilize "twin underwater turbines to generate 1.2-megawatts of electricity off the coast of Northern Ireland," which are said to "look and work very much like wind powered [alternatives]." Notably, the company even mentioned that the devices spin "too slowly to affect marine life," and just in case you're concerned about its future plans, it "intends to eventually build farms of turbines consisting of 10 to 20 pairs each."

[Via TechMeme]

Yeah, using Avurt's IM-5 launcher and Taser International's C2 stun gun sure seem like more enjoyable ways to injure-but-not-kill the baddies, but there's a certain novelty attached to the vision of an uber-powerful Super Soaker. Apparently, a team of Russians are toying with the idea of crafting a non-lethal weapon based around "electro-hydrodynamical effects." In layman's terms, what we're looking at is a device that relies on water jets to bring down enemies whilst minimizing long-term damage, and while we're not up to speed on all the mathematics that prove this valid, it sounds pretty plausible. And hey, it's not like ammunition wouldn't be readily available in many parts of the world. [Warning: PDF read link]

[Via Wired, image courtesy of iSoaker]

Washing machines that somehow remove the odors and spots from your garments sans the use of water have been around the block a time or two, and while we've heard a mad scientist claim that he discovered soap-free cleaning, it's Haier who's making him look brilliant. The detergentless WasH20 reportedly works by breaking down water molecules into OH- and H+ ions, and while we hardly recall the last chemistry course we took, we suppose we'll believe the claims for now. Apparently, the stains on the linens are "attracted and retained by ions of OH-, while the clothes are sterilized by the H+ ions." Word on the street has this one landing in France soon for around €699 ($957), but don't be surprised if your threads come out of the wash mutated, vaporized, or worst of all, smelling exactly like they did when they went in.

[Thanks, Philippe T.]

A Florida-based startup dubbed SeaAway (no relation to Segway, truth be told) is looking to make our ports a good bit safer in the future by implementing an offshore screening process that could detect "chemical, biological, and nuclear traces as ships travel through." The aptly-dubbed Sea Sentinels would be anchored to the seafloor some 14-miles from a port, and will even house up to 15 humans and an array of unmanned aerial vehicles for extreme situations. The platforms would utilize RFID readers to detect what types of cargo passed through its screen, and if sensors flag a suspicious container, the Coast Guard is called into action. Unfortunately, the $100 million it costs to erect each system would have to be subsidized by a passage fee of $20 per container, but tax breaks for shippers are currently be pondered. Nevertheless, a prototype system will see construction later this summer, and if all goes well, finalized versions could be patrolling our seas in the not too distant future.