How to spot a nuclear bomb

• Someday, ghostly subatomic particles known as antineutrinos could provide a clear view of what countries with illicit nuclear weapons programmes - such as, North Korea - are trying to hide. A collaboration of US and UK scientists announced that they are going to build a test antineutrino detector in a mine in England. Neutrinos are generated by nuclear fusion, as in the sun, where hydrogen atoms merge into helium, releasing heat and light.

Croc signatures

How do you tell an alligator from a crocodile?

• The best way is to stare down their sinister snouts, found palaentologists at Hokkaido University in Japan. Alligators have U-shaped faces that are wide and short, while crocodiles have slender, almost V-shaped muzzles.When an alligator closes its mouth, you tend to see only its upper teeth. Crocodiles, on the other hand, flash a toothy grin with their top and bottom teeth interlacing.

Study rhythms

• Students whose biological rhythms were out of sync with their class schedules - say, night owls taking morning courses - received lower grades due to "social jet lag," a condition in which peak alertness times are at odds with work, school or other demands. It may be time to tailor students' class schedules to their natural rhythms, suggests Scientific Reports.



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