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"physics"19 articles archived since 1845

The Mathematics of Change Ringing and Peal Bells

Change ringing, in which a band of ringers plays long sequences of permutations on a set of peal bells, is a little-known but surprisingly rich and beautiful acoustical application of mathematics

February 18, 2014 — George Hart and Simons Foundation

Invisibility Block Brings Cloaking Technology a Step Closer

Scientists in Singapore have discovered a way to make objects disappear from view by bending light around them. The technology has potential for use in the military and for surveillance, but could also be applied for other purposes such as disguising unsightly objects on buildings.

February 19, 2014

Is Our Universe a Hologram?

We take for granted that we exist as 3-D beings in a 3-D universe, but physicists suggest that our world is just the projection of a reality written in 2-D. Scientific American editor Michael Moyer explains.

Video credits - Production assistants: Kathryn Free & William Herkewitz, produced by Eric R. Olson

March 5, 2014

Ultrasonic Levitation

Nature Video finds out how to levitate objects using sound waves. Scientists can float objects in mid-air, using just the power of sound. Now, using ultrasonic speakers, they can levitate things with more control than ever before, moving small objects in three dimensions even with the whole array turned upside down. They have also developed virtual ‘holograms’ to visualise how the shapes made by the sound waves can ‘grab’ objects.This article was reproduced with permission and was first published on Oct 27, 2015. It is a Nature Video production.

November 6, 2015 — Nature Video

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