One truly elegant hypothesis of physics is the "zero-energy universe" hypothesis. It proposes that the net sum of the energy in the universe perfectly equates to zero. According to the idea, if you ...

The Law of Conservation of Mass dates from Antoine Lavoisier's 1789 discovery that mass is neither created nor destroyed in chemical reactions. In other words, the mass of any one element at the ...

Deep inside the Institute for the Study of Ancient Cultures—past cases filled with cuneiform tablets and giant stone sculptures that guarded the temples of long-dead kings—is a very modern laboratory.

Inside the book conservation lab at the Metropolitan Museum of Art. Credit... Supported by By Molly Young Photographs and Video by Nicholas Calcott Not every workplace features a guillotine. At a book ...