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...human history. BERNIE CLARK Ray Kurzweil estimates the next 100 years will bring a rate of change equal in impact to the last 20 000 years. PHIL PICTON Electronics is behind this rapid pace of change. It powers computers that allow us to design, communicate and investigate. ARMANDO MARINO The internet can connect us to friends and relatives anywhere on the planet. JEFF...

...human health or the environment. Toxic elements and compounds often block essential biological processes explain how excess anions or cations in aqueous solution can be removed by ion-exchange chromatography or an ion-exchange membrane explain how cations such as aluminium can be amphoteric, that is they can neutralise both acidic and alkaline solutions. Also recognise...

...resource extraction level, roughly five tons of materials are needed to produce a 1.2 ton car, creating ten tons of effluents and 2.5 tons of emissions. Processing these materials into components, assembling and distributing the cars around the world – and then using, servicing and disposing of them generates even more emissions. In total, a typical mid-size car is...