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The Focus Quiz
Climate change has been in the news again recently with the publication of the IPCC's latest report, but how much do you know about global warming and the greenhouse effect?
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Q&A

Dogs can survive on a vegetarian diet, but cats need meat, or a lot of additives to compensate. Among these are the amino acid taurine, not found in plants, and vitamin A, which dogs can...

If you mean 'absolutely' in the sense of 'completely', then no. The celebrated uncertainty principle of quantum mechanics shows that the more precisely we try to pin down the exact location of...

Eggshell is primarily composed of calcium carbonate, which is naturally white. Some birds coat the outside of their eggs with a pigment to improve camouflage or help identify their eggs from those...

As a reliable replacement for conventional medicine, no. A severe ear infection can result in pus being discharged from the ear, which will smell quite nasty, but that isn’t actually the...

Osmosis is a common biological process where water moves from a dilute to a concentrated solution, across a semi-permeable membrane, to balance the concentrations. This increases the pressure on...

The DNA in your cells is packaged into 46 chromosomes in the nucleus. As well as being a naturally helical molecule, DNA is supercoiled using enzymes so that it takes up less space. Try holding a...

One reason is that men are more prone to heart disease. This may be because women have lower levels of iron since they lose blood through menstruation, or it may be the damaging effects of...

For many people, the low-carb diet went the same way as its principal advocate, Dr Robert Atkins, who died in 2003. At the time, the popularity of the diet prompted warnings from, among others,...