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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

Tropical rainforests don’t experience the winter and summer extremes seen in temperate rainforests. Often, tropical trees grow in a similar way all year round, meaning growth rings are not...

It doesn’t. The hairs on your head grow for between two and seven years. This lifespan is controlled by your genes and is the limiting factor for your hair’s maximum length. Hair is a...

It is probably a manifestation of our natural self-grooming behaviour. Our ape relatives constantly examine themselves and each other for ticks, dirt and small wounds, and any deviation from the...

Of course, no-one will ever go there to find out for certain, but we can still be pretty sure that it’s around 15,000,000°C. That’s the figure obtained from detailed mathematical...

No. They have always been very aggressive, particularly when defending nesting sites. What they are becoming is more numerous. In the wild, herring gulls might only raise one chick to maturity for...

Sometimes it’s a side effect of hunting behaviour in an animal too dim to work out that the tail always escapes. But tail chasing can become obsessional. Bored dogs that don’t get...

There is a tendency in evolution for animal lineages to get larger over geological time scales. This is known as Cope's Rule, after 19th-century palaeontologist Edward Cope. Horses, elephants,...

There is no way to tell from a fossil whether the animal was sleeping when it died or not. But it seems likely that the four-legged dinosaurs probably mostly slept standing up to allow them to...