For this end-of-the-year/start-of-the-year How on Earth show, we look back to 2017 with clips from some of our features from the past year: selections about tracking methane leaks, ketogenic diets, using MDMA to treat PTSD, gravitational waves, the solar eclipse, space missions, and the politicization of science. Those are just a few of the topics we covered in 2017, which also included: the continuation of the Our Microbes, Ourselves series, global warming and climate change, research about aging, mutant proteins, how humans have altered nature, future technologies, nuclear tests and the Van Allen belts, biofuels, extinctions following an asteroid impact, monorails, life expectancy in America, observing stellar occultations by objects in the distant solar system, space shields for satellites, virtual colonoscopies, the Search for Extraterrestrial Intelligence (SETI), chronic fatigue syndrome, protecting pollinators, testing our drinking water, cancer, the Long Now foundation, citizen science, fracking, and more!
Hosts: Joel Parker, Susan Moran
Producer, Engineer: Joel Parker
Additional Contributions: Beth Bennett, Shelley Schlender
Executive Producer: Susan Moran
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The Unnatural World (start time: 6:58): It’s an audacious topic for a book: the planet, and audacious individuals who are working to save — actually, to remake — human civilization and our home on Earth.

Today’s show offers the following feature:
This August 21st, some parts of the Earth will be plunged into darkness in the middle of the day. It will be a solar eclipse; the moon’s shadow will cross the United States from Oregon to South Carolina, with the path closest to Colorado passing through Wyoming and Nebraska.
We offer two feature interviews on today’s show.

Testing Drinking Water (start time: 14:00): Two years ago Flint, Mich., turned the issue of lead in
In their upcoming book,

Your Brain on Nature (start time: 5:49): You may think it’s a no-brainer: that nature is good for your mental and physical health. After all, a walk in the woods or even an urban park brightens your outlook on life, at least for a little while. Turns out, the notion that being outside in nature boosts our mood, and even our creativity, has historical roots at least as deep as