Hawking's wit and genius earned him accolades in academia and in popular culture.
A CDC study found an acceleration in the number of hospital visits due to overdoses from drugs like heroin, fentanyl, and prescription painkillers.
The planet will face a 40 percent water deficit if global warming continues at its current pace, according to the United Nations, highlighting the importance of efficient agricultural practices.
The number of the Adelie penguins has declined by about 70 percent in recent decades due to sea ice melt.
The company's Falcon Heavy rocket is headed for Mars orbit, with CEO Elon Musk's cherry red Tesla Roadster as payload.
Press reports have revealed that Volkswagen, Daimler, and BMW funded studies exposing human subjects and monkeys to nitrogen dioxide during tests of diesel exhaust.
The Iranian oil tanker Sanchi collided over a week ago with a freighter, and Chinese officials say the oil slick is now 128 square miles, threatening marine life, including humpback and grey whales.
Nearly 4,000 solar panels, covering an area the size of two football fields, have been installed at the site of the 1986 nuclear disaster.
Sea ice around the North Pole fell to the smallest extent on record, and Arctic temperatures were the second highest ever recorded, according to an annual report by the National Oceanic and Atmospheric Administration.
Led by Britain and Canada, nations form the Power Past Coal Alliance to phase out use of the dirtiest fossil fuel — but big emitters remain absent.