PITY THE POOR MALTHUSIANS:

More than 96% of the water in the world is seawater, which contains too much salt for humans to drink. Removing that salt and turning seawater into drinkable fresh water could provide access for billions of people who currently don't have it.

Methods to get fresh water from salt water already exist, but they use huge amounts of energy and leave behind unwanted leftovers. For example, brine -- a super-salty liquid containing all the minerals and impurities removed from the seawater -- can damage sea life when it's dumped back into the ocean.

But Manhat wants to change that with help from its floating stills. These devices use a transparent structure -- similar to a greenhouse -- to warm the surface of the ocean beneath them and then trap the resulting water vapor. 

The device doesn't collect salt or brine over time, so it's safer for sea life. And since it floats on the water, it doesn't take up space on land. This makes it ideal for coastal areas and small countries with little land to spare for water purification.

Making clean water more easily accessible will benefit people around the world who are currently at risk of illness from unsafe water sources. It could also help address drought in many areas, including the U.S.

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