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 ...

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 ...

In a finding that could be useful in designing small aquatic robots, researchers have measured the forces that cause small objects to cluster together on the surface of a liquid -- a phenomenon known ...