Physicists discover the upper limit of electrical resistance in metals
Electrical resistance is easy to notice and hard to pin down. Power lines shed energy as heat, and…
‘Mini Universe’ built from ultracold atoms measures time without a clock
A trapped cloud of ultracold atoms, colder than almost anything found in nature, has become the setting for…
24,000-atom mini universe demonstrates time flow without a clock
What if time isn’t woven into the fabric of reality at all? A new experiment suggests that the…
Historic discovery shows atoms can exist in two places at once
A cloud of helium atoms split, scattered and fell under gravity, yet still behaved as if its parts…