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Aspirin can protect against cancer - and treat it too

Aspirin is already used by millions to reduce the risk of heart attacks and strokes. But the latest research suggests that the drug could also have a major role in treating and preventing cancer. Cheap and safe, it is the nearest we have to a wonder drug, says Jeremy Laurance. So, should we all be taking it?

The six leading theories on why we dream

Freud claimed that when you are asleep, your primal impulses gained the chance to express itself and that is what dreams are made of; our unsuppressed and unconscious desires and dreams

The science of vision: How do our eyes see?

We see the world in wavelengths of red, green and blue, but most other animals only see in yellow and blue. Some species of fish, reptiles and birds have four-colour vision, and are able to see ultraviolet or infrared light too

Why can't gay men donate blood?

A lifetime ban on men who have sex with men donating blood was initially enforced following the rise of HIV and Hepatitis B in the 70s and 80s, but was changed in 2011. Men are now excluded from donating blood for 12 months following sexual activity with men. But is it time to rethink this?

Four gay men share their views on the HIV prevention drug

In London an estimated one in eight gay men are living with the virus. A recent trial showed PrEP successfully reduced the risk of HIV infection by 86 per cent among participants. Now, the NHS is in the process of deciding whether to make the drug available