HIV/Aids: We are all unprotected

Sarah Boseley: On World Aids Day, the Global Fund is collapsing. No fund means millions more in sub-Saharan Africa and beyond at risk

Multiple gene test allows more targeted treatment of cancer

SNaPshot test looks for mutations in key genes of patients with cancer so they can be given the most effective drugs

Daniel Denvir: Given the comic failure of abstinence-only – 95% of Americans have premarital sex – isn't it time the US got over its hangup?

Halloween's associations with death, evil and skeletons may subconsciously put women off giving birth, claim scientists

How to Win Friends and Influence People in the Digital Age includes advice for bloggers but keeps rules of the 1936 original

Want to be fit without doing exercise? Hadley Freeman dons her special shoes to examine some of the finest products on the market

A large study has shown that the risk of clinical depression is lower among women who drink coffee

French-born author of a bestselling guide to the treatment of cancer

Hugh O'Shaughnessy: The attitude of the US establishment to central America has barely changed since the syphilitic atrocity of 1946-8

Stewart J Lawrence: Meditation may help with PTSD, but some yogis are dismayed that their peace-loving practice is now turned to combat training