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...energy for this kind of exercise, it’s darn hot out in the desert? So let’s see if we can work out how much energy our ambulance crew would expend to get that truck up the slope. One way of doing this is to use trigonometry. What the crew are effectively doing is lifting the truck up vertically from the bottom of the slope to the top. We know that they have a distance...

...energy, such as moving matter around within a solid without risking melting or changing the basic shape of a component. On the other hand, it can be a real nuisance. It can make magnetic disks 'forget'. It can leave materials 'sapped' of their strength. Just a few degrees of temperature change can make some things unrecognisably different. Temperature really does present...

...Solar System, and its extraordinary results will be studied in the world’s leading scientific journals for years to come... Mission to Titan An brief introduction to this album. The Cassini-Huygens Probe Adam Hart-Davies introduces one of the most ambitious space exploration missions ever launched. Titan: first glimpse OU professor John Zarnecki shows the first ever...

...the tiny green structures called chloroplasts. These give leaves their colour, and capture light energy from the Sun. What happens next is a complex chain of reactions that can be summarised very simply. Water and carbon dioxide are converted, using the sun's energy, into simple sugars. The oxygen released in the reaction is now available for other organisms to respire....

...energy usage. In the meantime, we in the UK face a national problem. We rely on gas for a lot of our energy. It’s cleaner than coal, but we’re running out. I’m very uneasy about relying on Russia and other eastern nations to supply a major fraction of our energy needs, which is the prospect we face if we don’t produce gas of our own. Fortunately, there is a...