c3 More than 57 billion tons of soil have eroded in the U.S. Midwest With soils rich for cultivation, most land in the Midwe…
b2 How ancient, recurring climate changes may have shaped human evolution Recurring climate changes may have orchestrated where H…
e5 ‘Wandering’ salamanders glide like skydivers from the world’s tallest trees In one of the tallest trees on Earth, a tan, mottled sa…
b2 COVID-19 has killed a million Americans. Our minds can’t comprehend that number One million deaths. That is now roughly the toll of COV…
