In some of the world's hottest countries, where cooling systems are most needed, the infrastructure required to power such setups is often lacking. A new system could help, as it provides multiple cooling effects but uses no electricity.

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Although advances are occurring in the field of powered prosthetics, the devices still require heavy batteries. Scientists at Rice University are trying to change that, by creating a pneumatic "extra limb" that's powered by the wearer's footsteps.

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While the farming of salmon does help take pressure off wild stocks, the feed used to raise the fish still isn't entirely sustainably sourced. That may change, however, thanks to nutrient-rich worms that eat readily available seaweed.

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The multi-tools continue to come thick and fast on Kickstarter, which means that if one is going to stand out, it has to be different in some way. Made by Hong Kong-based AntDesign, the E-one distinguishes itself with a bit-carrying "autodoor."

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It was just last week that we heard about the Octo, a carabiner multi-toll with an integrated bit driver, but no way of carrying any extra bits. Well, the Drivr2L has room for four of the things, plus it packs various other features.

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Instead of using insecticides, farmers will sometimes cover their plants with a mesh fabric. A new such material has now been developed, which keeps out a wider range of bugs while still allowing crops to get enough sunlight and water.

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There are many parts of the world in which fresh water may be plentiful, but it's also full of harmful microbes. An experimental new filter is able to purify such water for drinking, and it's powered solely by sunlight.

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The color-changing skin of the squid has inspired a new type of infrared-reflecting, metalized polymer film with tunable heat-management properties that could make it useful in everything from coffee cups to shipping containers.

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Lead-contaminated tap water is still a problem in much of the world, where conventional lead removal filters may be too expensive for most households. An inexpensive new filter could help – and it was designed by a group of high school students.

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When most people think of life vests, they likely picture yokes that are worn around the user's neck. Switlik Survival Products' new UA-80 Evolution Vest takes what is claimed to be a better approach, however, by going under the arms.

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