International

"Believe it or not, we use more of this natural resource than any other except water and air. Sand is the thing modern cities are made of."

"A small plane with two sick U.S. workers arrived safely in Chile late Wednesday after leaving Antarctica in a daring rescue mission from a remote South Pole research station, officials said."

"An airplane powered solely by the sun landed safely in Seville in Spain early on Thursday after an almost three-day flight across the Atlantic from New York in one of the longest legs of the first ever fuel-less flight around the world."

"How a $3.1 Billion Expansion Collided With Reality"

"The ocean contains a vast number of living things, including many, many pathogens — from bacteria that thrive on coral to fungi that infect lobsters. A drop of seawater may hold 10 million viruses. Recently, a team of scientists revealed a frightening member of this menagerie: free-floating cancer cells that cause contagious tumors in shellfish."

"Cities in six continents joined up to form the world's largest alliance to combat climate change on Wednesday, a move intended to help making ground-level changes to slow global warming."

"The US Food and Drug Administration on Monday approved the first human trial of an experimental Zika vaccine, according to a joint announcement by the two companies behind the new therapy."

"A solar-powered airplane took off from New York's John F. Kennedy International Airport early Monday, in a bid to have the Solar Impulse 2 craft cross the Atlantic Ocean and land in Spain on Thursday."

"At night, just after the full moon, teams of scientists dive beneath the waves to study one of the planet’s most prolific and mysterious rites of reproduction."

"A report released Monday by the nonprofit watchdog group Global Witness claims that 2015 was the deadliest yet for people who sought to protect their land, forests and rivers from mining, logging and dams."