Bipyramid

A bipyramid is a polyhedron formed by joining two identical pyramids base-to-base. The bipyramids are the dual polyhedra of the prisms. Three bipyramids can be made out of all regular triangles, the octahedron (square bipyramid), which counts among the Platonic solids, and the triangular and pentagonal bipyramids, which count among the Johnson solids.

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In the News

Researchers Create New Super-thin Laser Mirror
Engineers at UC Berkeley have created a new high-performance mirror that packs the same 99.9 percent reflective punch as current high-grade mirrors, but in a package that is 20 times thinner and easier to manufacture. The new mirror could dramatically improve the design and efficiency of next generation laser optics for such devices as high-definition DVD players, computer circuits and laser printers.

Lychnis Moth (Hadena Bicruris) Lays More Eggs In Isolated Areas
The Lychnis moth (Hadena bicruris) is laying more eggs on white campion (Silene latifolia), due to the increasing fragmentation of the countryside. Dutch researcher Jelmer Elzinga studied how many white campion seeds were eaten by Lychnis moth caterpillars at various locations along the River Waal.

Chest Radiographs Can Predict Risk Of Death In SARS Patients
Radiologists can estimate the risk of death to a SARS patient by the seventh day from the onset of symptoms by using chest radiographs, according to a new study by researchers in Hong Kong. This early determination can allow a physician to better tailor treatment for the SARS patient.

Labor Day Marks Appreciation of U.S. Workers
Background about this U.S. holiday celebrated on the first Monday of each September to commemorate workers. Discusses the holiday's origins, contrasts it with May Day (on which a number of European and other nations celebrate International Workers' Day), and explains how Labor Day has traditionally marked the end of summer with activities such as picnics and barbecues. From the U.S. Department of State's Bureau of International Information Programs.

Physicians May Need To Dig Deeper When Treating HIV-related Lymphomas
When it comes to treating HIV-positive patients with blood cancers, not all lymphomas are created equal, according to hematologists from the University of Southern California.

Qubit Link Could Pave The Way For World's Most Powerful Computers
Scientists at The University of Manchester have made a major breakthrough which could pave the way for a new type of high-speed computer. Professor Richard Winpenny, of the School of Chemistry and a team of international researchers, have discovered a new method which could hold the key to creating the first practical quantum computers. If built, quantum computers would be the most powerful computers ever made, with speeds millions of times faster than the average PC for some calculations.

[Ironic] LONDON: A jailed cocaine dealer is working as Santa Claus on
John Tams, who dons beard, boots and red suit to work in a cafe's Christmas grotto, said he wanted to give something back to the community...

[Ironic] LONDON: A jailed cocaine dealer is working as Santa Claus on
John Tams, who dons beard, boots and red suit to work in a cafe's Christmas grotto, said he wanted to give something back to the community...

Riders On The Storm: Drifting Buoys &Floats Weather Hurricanes For Bet
While some are still cleaning up from the series of hurricanes that plowed through the Caribbean and southern United States this season, scientists supported by the Office of Naval Research are busily cleaning up valuable data collected during the storms.

World's Most Powerful Infrared Camera Opens Its Eyes On The Heavens
A new astronomical camera has begun operations on the United Kingdom Infrared Telescope (UKIRT) in Hawaii. The Wide Field Camera (WFCAM), built at the UK Astronomy Technology Centre (UK ATC), Edinburgh, is the world's most powerful infrared survey camera.


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