It took just over two years for the radioactive plume from Fukushima, Japan, to travel via ocean currents and reach the shores of North America, researchers say.
Volcanic eruptions 66 million years ago played a role in the demise of the dinosaurs, says one theory. It challenges the idea that a meteorite impact was the sole cause.
There's a unique collage of more than 100 trillion microorganisms living on and in you that are essential to your life and part of what makes you, well, you. It's your microbiome.
Eleanor Imster has helped write and edit EarthSky since 1995. She was an integral part of the award-winning EarthSky radio series almost since it began until it ended in 2013. She and her husband live in Tennessee, where they enjoy guitar playing and singing. They have 2 grown sons.