The energy state of an atom is denoted by its principal quantum number, designated n, which defines the probability of ...

The test subject that produced the first 3D magnetic resonance image was quiet and a bit hairy. Tough on the outside, the patient was a big softie at heart. It was also not human. Nobel Prize-winning ...

An exhibit at Philadelphia's Science History Institute looks at food science through the lens of the school lunch program. (Emma Lee/WHYY) From Philly and the Pa. suburbs to South Jersey and Delaware, ...

Science occasionally gives us clearer views of the distant past. This year, researchers opened windows into the life and times of ancient Romans, impressionist painters and other towering historical ...

“A lightning flash lasts only a few tenths of a second. Why does the resulting sound persist for half a minute or even longer? A typical lightning discharge consists of three strokes through a channel ...

Philadelphia children eating a "three-cent dinner" at school, featured in the 1913 book School Feeding: Its History and Practice at Home and Abroad Science History Institute A new exhibition in ...

Synthetic dyes made fashion more vivid, like this hot pink miniskirt suit, designed by Ben Zuckerman in 1964. (Emma Lee/WHYY) From Philly and the Pa. suburbs to South Jersey and Delaware, what would ...

Science is collaborative, painstaking and iterative, with progress slow and some unsung scientific heroes lost to time. But every once in a while, a key event, discovery or conceptual breakthrough has ...

“Imagine that the earth has been watched over the aeons by an extremely patient extraterrestrial observer. Nothing, save a little hydrogen and helium, leaves the planet. And then, less than 20 years ...