Limited wavelengths: the Casimir effect arises because virtual photons at certain wavelengths cannot emerge in a gap between two plates (Courtesy: iStock/4X-image) Physicists in the US have worked out ...

The attractive force between two surfaces in a vacuum - first predicted by Hendrik Casimir over 50 years ago - could affect everything from micromachines to unified theories of nature. What happens if ...

1. Reactions toward small novel objects were studied in two highly cautious isolation-reared chimpanzees. 2. In Experiment 1 the subjects were presented with 75 different objects. Grasping increased ...

Galaxies, planets, black holes: to most people, everything about our Universe sounds and feels enormous. But while it's true ...