Now, those hard tires will have a lower-temperature working range.

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The resourceful DIYer plans to keep working on his high-temperature system until he can build custom creations from Delrin and Polycarbonate.

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Dr Michel Alary, an Aids specialist in the department of medicine at Laval University and the Saint-Sacrement Hospital Research Centre, said that the extremely high temperatures in sub-Saharan African countries could prevent the gel working there if it requires room temperature to be effective.

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It is, however, a plausible hypothesis, and there is some evidence that their autonomic nervous systems (which control basic bodily functions such as heartbeat and body temperature) have not been working properly.

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California-based Nest Labs, founded by two former Apple executives, produces a thermostat capable of learning user behaviour and working out when a building is occupied or not, using temperature, humidity, activity and light sensors.

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In a blog post, it said a "rapid and substantial temperature spike" had caused a large number of servers to stop working.

BBC: Outlook.com screenshot

When working, it splits light into its component colours, to reveal information about the chemical content, temperature and motion of planets, comets, stars, interstellar gas and galaxies.

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In recent weeks Dr Smith and Dr Sample, working with Scott Southwood, another researcher at the University of Washington, have built a weather sensor that measures temperature and light levels and sends a packet of data every five seconds by radio.

ECONOMIST: Monitor