Modern cryptography combined with simple radiation detectors could allow nuclear-weapons checks to be carried out with almost complete security. That is the conclusion of scientists in the US, who ...

DURHAM — A classroom of sixth-graders demonstrated Wednesday that a combination of theater, masking tape, marbles, and empty toilet-paper rolls can help students understand how roller coasters work.

“Gas marbles” have been created by encapsulating a bubble of gas within a shell of tiny plastic particles. Developed by Yousra Timounay and colleagues at the Université Paris-Est (UPE) in France, the ...