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...carbon-based, but it is a complex system. So, AI could satisfy some of the criteria for life, especially as it becomes more sophisticated. You may have different levels of understanding of each of the examples and so have quite different notes to those here, but this will have made you realise that defining life is very complex and may even change as we come to understand...

...carbon, heat-treated steel which, presumably, he thought meant that you could build a less substantial structure. Undoubtedly he expected lower ‘live’ loading than in Pittsburgh. But each bridge was a much longer span and so the loads at the tops of the chains in the towers would have been greater than in the bridges in Pittsburgh. The towers themselves were less...

...carbonate (CaCO3). Whereas most minerals are identified on the basis of physical characteristics (density, hardness, colour, etc.) calcite can also be readily identified with a chemical test. Calcite reacts with dilute hydrochloric acid, liberating bubbles of carbon dioxide (CO2) gas in a vigorous fizzing froth. The chemical reaction is written as In words, this equation...