Heat may spark world food crisis

Half the world's population could face food crisis by 2100 as soaring temperatures cripple staple crops, scientists warn.

news.bbc.co.uk

Earth Watch

Why it is hard to predict sudden environmental crises

news.bbc.co.uk

Panda bites his third tourist in two years at Beijing zoo

A panda at Beijing zoo bites a man for the third time in two years.

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Animal matters

Scotland's debate over tests on primates

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Black holes 'preceded galaxies'

Astronomers believe they have solved a cosmic chicken-and-egg question: what came first - black holes or galaxies?

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Body repair 'could be ramped up'

A combination of drugs could trick the body into sending its repair mechanisms into overdrive, say scientists.

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Zimbabwe troops 'eat elephants'

A Zimbabwean wildlife campaigner tells the BBC that soldiers are being given elephant meat to eat, as the economic crisis deepens.

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Eat it or lose it - why centuries of crop diversity are at risk

Centuries of crop diversity are at risk of being lost forever as farmers turn to just a few modern, high yielding varieties.

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Our writers talk back

Some of the previous contributors to the Green Room respond to readers' questions and comments.

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Beagle hunter

On a mission to find the most famous ship of science

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First flight of algae-fuelled jet

Continental Airlines is the latest to test fly a jet biofuel, this time with a product derived partially from algae.

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Feilden's blog

Ground-breaking new technique in stem cell science

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Holes give edge to new armour

Scientists from the UK Ministry of Defence (MoD) have devised ultra-hard vehicle armour to protect military personnel.

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A deep-sea fish caught in the Pacific has mirrors for eyes

A deep-sea fish caught in the Pacific has eyes which use mirrors as well as lenses, scientists discover.

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US vows 'huge' marine protection

The US is to establish "the largest area of protected sea in the world", banning fishing and mining, around its Pacific islands.

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Mosquitoes make sweet love music

Sexy songs sung by mosquitoes in courtship could be key to curbing the spread of dengue fever, say scientists.

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'Wolfman' returns

Explorer Jim McNeill tracks down Arctic wolves

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Tech fair offers greener vision

Analysts at the Consumer Electronics Show say green credentials of tech products will become critical to success.

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Poetry or science?

Is romantic love just a chemical cocktail?

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Canadians claim South Pole record

A trio of Canadians claim a new record for the fastest trek across Antarctica to the South Pole.

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Venomous mammal caught on camera

Rare footage of one of the world's most strange and elusive mammals is captured by scientists.

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China alert over bird flu death

Chinese authorities shut down and clean poultry markets in Hebei province, after the first human death in nearly a year.

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Baby Jupiter's huge weight gain

The planet Jupiter must have gained mass fast during its infancy, according to astronomers.

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Mummy of female pharaoh uncovered

Egyptologists find remains of a mummy thought to belong to a queen who ruled 4,300 years ago, Egypt's antiquities chief announced.

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Everest trip helps critically ill

Blood oxygen levels recorded on a trip by medics to Everest could help the treatment of critically ill patients.

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 Science > Math > Geometry > Polytopes

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Science > Math > Geometry > Polytopes

Polytopes:

The Charged Particles Model

Polytopes and optimal packing of p points in n dimensional spheres. Includes a java applet based on a model which allows for generation of multidimensional regular and semi-regular polytopes.

http://presh.com/hovinga

Graand

Free Classified Ads Portal

www.graand.com

The Geometry Junkyard

Comprehensive list of links to sites on geometric properties of the shapes.

http://www.ics.uci.edu/~eppstein/junkyard/polytope.html

Guy's Polyhedra Pages

Vertex figures, filling, faceting diagrams, stellation, defining polytopes through generators, trimethoric and trisynaptic polyhedra, space-filling polyhedra, lost stellations of the icosahedron, and links.

http://www.queenhill.demon.co.uk/polyhedra/

The Mathematical Atlas - Polytopes and Polyhedra

Collection of discussions regarding volume, vertices, dissection, g-holed tori, and other subjects.

http://www.math.niu.edu/~rusin/known-math/index/52BXX.html

Numericana - Polyhedra & Polytopes

Enumeration, cartesian coordinates of vertices, naming, and counting the shapes.

http://home.att.net/~numericana/answer/polyhedra.htm

Pick's Theorem

Describes a theorem for finding an area of simple lattice polygons. Includes proof and Java applet simulation.

http://www.cut-the-knot.org/ctk/Pick.shtml

Polytopes

Derivation of volume equations for regular polygons, polyhedra, and polytopes, with images.

http://www.math.rutgers.edu/~erowland/polygons.html

Zome Edu

Educational toys used to teach geometry and model building to create squares, spheres, stars and other regular shapes with sticks and connecting pieces. Products include kits and lesson plans.

http://www.zometool.com/educators.html