U.S.

Google will add every railroad crossing in the country to its Maps application. Visual and audio alerts will signal these potential hazards to users. The Federal Railroad Administration has asked Apple, TomTom and other companies that provide GPS services to do the same after a large year-over-year increase in crossing accidents in 2014.

UNITED ARAB EMIRATES

Dubai will house the first fully functional 3-D-printed building, announced the city's Museum of the Future. A 20-foot-tall printer will construct the 2,000-square-foot office.

MEXICO

A deep-sea submarine discovered a 0.25-mile-long field of hydrothermal vents along a fault in the Gulf of California's seafloor. At 12,500 feet, they are the deepest high-temperature vents ever found in the Pacific.

CUBA

The World Health Organization certified the island nation as the first country to eliminate the transmission of HIV and syphilis from mother to baby.

RUSSIA

Scuba divers helped an international team of physicists install a spherical neutrino detector more than 4,000 feet below the surface of icy Lake Baikal in Siberia.

INDONESIA

A plane dumped several tons of cloud-seeding salt over central Sumatra in a government-supported effort to induce rain and relieve a seasonal heat wave. The attempt failed to produce any showers.