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...free course, Microbes friend or foe? sheds some light on them...Microbes often get a bad name. Whilst some of them do cause disease, others play vital roles in recycling nutrients in the soil to enable plants to grow, and in breaking down human waste. Without microbes, we would have no beer, no yoghurt, no coffee. That's quite impressive for something too small to see....

...free course, Energy resources: solar energy, explores the Sun as a potential source of usable energy...Energy from sources other than fossil and nuclear fuels is to a large extent free of the concerns about environmental effects and renewability that characterize those two sources. Each alternative source supplies energy continually, whether or not we use it, and most...