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...History of Numbers Starting in Africa 20,000 years ago, trace the history of numbers through time, including Egyptian use of fractions and the problems of Roman numerals. Complex Numbers Computer generated animations looking at 'Complex Numbers'. Rational and Irrational Numbers Using tally sticks, a cake, a thermometer, a number line and graphics boards, David Brannan and...

...history A look at the geological history of Tibet and the Raymo Ruddiman hypothesis; that chemical weathering increased as the temperature dropped due to the rise in the plateau. Raymo and Ruddiman believed that the uplift of the Himalayas caused global cooling. Tibet: The signifiicance of the strontium ratio The importance of strontium isotopes in chemical weathering, a...