The winter solstice can fall on any day between Dec. 20 and 23, depending on the year, but the 21st and 22nd are the most ...

Discover how the U.S. Department of Health and Human Services promotes health, offers essential services, and innovates in public health research across America.

Depending on how you look at it, this catchphrase from a 1980s pop song is decently accurate: you can actually melt the ...

Whether space, health, technology or environment, here are the issues in science that the editors of Scientific American are ...