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...base material to the object to be coated. Often used to silver plate cutlery and other decorative objects...[Images to demonstrate 'Electroplating' - see article ] The articles to be electroplated are immersed in an electrolyte containing dissolved salts of the metal to be deposited, and they are made the cathode to a DC supply. To complete the electrical circuit, anodes...

...based diagnostic kits that will help doctors identify dormant tumours before they become too big to treat effectively. Once dormant cancer cells have been identified, they need to be eliminated. Unfortunately, since these cancer cells are metabolically inactive, they are less likely to be killed by conventional chemotherapy, so targeting them is difficult. Difficult, but...

...based material and rock dust. A comet can develop a spectacular million kilometre-long tail of gas and dust when its elongated orbit brings it close to the sun. The warmth of the sun vaporises water, carbon monoxide and other volatile substances that are otherwise held as ice. Jets of gas escape from the solid part of the comet (its nucleus) to feed the growing tail....