Science

The State Department of Health advised doctors to consider a booster or third dose of a Covid-19 vaccine for people with weakened immune systems.

Scientists in the Arctic discovered a preserved frozen lion cub that was approximately 28,000 years old. The animal was found in permafrost in a Siberian cave with its whiskers still intact.

A climate change-fueled megadrought engulfing the U.S. West. has pushed water levels at many lakes and reservoirs to new lows.

Renewable wind and solar energy now make up about 10 percent of the electricity used in the U.S. — but sometimes the sun doesn’t shine and the wind doesn’t blow.

A warming atmosphere due to increased greenhouse gas emissions threatens to destabilize the Atlantic Meridional Overturning Circulation.

Human activities in urban and agricultural areas throughout the Mississippi River watershed primarily cause the annual “dead zone.”

Tufts University researchers analyzed compounds found in dog foods associated with canine dilated cardiomyopathy.

Children are heading back to school soon, forcing parents to make tough decisions on how to handle a different kind of risk environment.

Hurricane season lasts through the end of November, with its peak running from mid-August to mid-October.

The International Space Station performed an unexpected backflip after a thruster fired, though officials said astronauts on board were not in danger.

The lake once sprawled across Bolivia’s high-altitude altiplano, but now decades of water diversion combined with a warmer and drier climate mean it may never return.