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The ancient Maya might be known for their mathematical aptitude, their accurate calendars, and their impressive temples. But did you know they were also salt entrepreneurs?

During the peak of Maya civilization – from 300 to 900 A.D. — coastal Maya produced salt by boiling brine in pots over fires. The end result was shaped into salt cakes, then paddled by canoe to inland cities and traded at extensive markets.

Some of the world's top climate scientists have concluded that global warming is likely to reach dangerous levels unless new technologies are developed to remove greenhouse gases from the atmosphere.

The United Nations' Intergovernmental Panel on Climate Change (IPCC) says pledges from the world's governments to reduce greenhouse gases, made in Paris in 2015, aren't enough to keep global warming from rising more than 1.5 degrees Celsius (2.7 degrees F) above pre-industrial temperatures.

Paige Thesing has struggled with insomnia since high school. "It takes me a really long time to fall asleep — about four hours," she says. For years, her mornings were groggy and involved a "lot of coffee."

After a year of trying sleep medication prescribed by her doctor, she turned to the internet for alternate solutions. About four months ago, she settled on a mobile phone meditation app called INSCAPE.

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