ECUADOR

Scientists have identified a new hummingbird species in the Ecuadorian Andes. But very few of the birds exist, and the species is considered critically endangered. Its habitat is shrinking as nearby communities burn the native landscape to make way for cattle grazing.

GERMANY

Germany has launched the world’s first hydrogen powered trains in an effort to reduce its dependence on fossil fuels. The trains, which can reach speeds up to 140 kilometers per hour, have fuel cells that convert hydrogen and oxygen into electricity.

ISRAEL

Scientists have discovered the world’s oldest-known brewery in a cave near Haifa. They found residue from 13,000-year-old wheat and barley-based beer that resembled porridge. The previous earliest known brewery was thought to be 5,000 years old.

RWANDA

Rwanda is setting up its first research center for noncommunicable diseases, including diabetes and cancer. Such illnesses currently account for 46 percent of the country’s total deaths by all diseases—a 100 percent increase from 2000.

CHINA

The Chinese government is requiring athletes who want to compete for the country in the 2022 Beijing Olympic Games to have their genomes sequenced. Officials say this practice is to screen for medical conditions that could affect the competitors’ performance; some scientists have called it discriminatory.

PAKISTAN

Researchers have detected the flesh-eating amoeba Naegleria fowleri in the domestic water supply of Karachi, Pakistan’s most populous city. The metropolis of 15 million people has seen an alarming uptick in cases of a fatal type of encephalitis caused by the parasite.