'Problematic' Greenland polar bear may be shot

A polar bear in Greenland may be shot dead next time it endangers people after several close encounters, including one where it bit the hand of a documentary team member, authorities said.

Pinning down the ampere with a supersensitive particle detector

From light bulbs to cell phones, all electronic devices in everyday life rely on the flow of electrons to function. Just as scientists use meters to describe the length of an object or seconds to measure the passage of time, ...

From Russia, with fruit: Arctic mission gets record resupply

A Russian icebreaker has made a successful supply run to exchange crew and deliver goods to an international expedition that's been adrift in the high Arctic for months trying to improve scientific understanding of climate ...

The kilogram is being redefined – a physicist explains

How much is a kilogram? 1,000 grams. 2.20462 pounds. Or 0.0685 slugs based on the old Imperial gravitational system. But where does this amount actually come from and how can everyone be sure they are using the same measurement?