Earth’s Oldest Asteroid Impact is Two Billion Years Old

The oldest asteroid collision on the planet, the Yarrabubba impact crater in Western Australia, is a whopping 2.229 billion years old. After analyzing minerals at the crater site, researchers have found the asteroid hit at the end of an era called Snowball Earth (one of the planet’s ice ages). Scientists, led by Dr Timmons Erickson (a geochronologist at Houston’s NASA Johnson Space Center), studied around …

Link About It: This Week’s Picks

Ginormous diamonds, living robots made from frog stem cells, and more from around the web

Preserving the Scents of Everyday Life Researchers at the UCL Institute for Sustainable Heritage are working double-time to identify and catalog scents that exist all around us—from the smell of an old book, to a pub at a particular time of night, and worn-in leather. Many of these are disappearing right under our noses. For example, as we collectively move deeper into a digital age, …

World’s First Living Robots Assembled from Frog Stem Cells

“These are entirely new lifeforms. They have never before existed on Earth,” Michael Levin, the director of the Allen Discovery Center at Tufts University in Medford, Massachusetts, tells The Guardian. “They are living, programmable organisms.” Levin and other researchers in the US have created the first-ever living machines: robots composed of biological tissue, assembled from African clawed frog (xenopus laevis) stem cells and designed on …