SPACE PHYSICS
Instant Expert: Black holes They are among the weirdest and most mysterious objects in the universe. Find out all about these cosmic vacuum cleaners with our comprehensive guide to black holes
HEALTH
Dilute disinfectant boosts bacterial resistance Some microbes and viruses become resistant to disinfectant if exposed to dilute solutions, which may be accelerating their spread in hospitals
OLD AGE
Monkeys listen to their elders Teenagers: learn from your primate cousins. Campbell鈥檚 monkeys pay most attention to the calls of older members of their species
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TECHNOLOGY
Typing style reveals stress levels A person can be identified just from their typing style. A stressful environment affects keyboard rhythms too. It could provide a way to tell if a person was forced to access, say, a bank account under duress
2009 REVIEW
Favourite picture galleries See carnivorous robots eager to eat insects, snapshots from inside exploding stars and bizarre devices from medicine鈥檚 dark past in a collection of last year鈥檚 picture galleries
2009 REVIEW
Top videos The best of our video coverage, including a tiny hovering robot, bionic penguins, software that can make home movies look professional, and plasma ejections from the sun
2009 REVIEW
Most popular articles From female ejaculation to the discovery of vampires in mass graves, read the year鈥檚 most clicked-on stories. Also see the most popular space and physics stories 鈥� including how to get to Mars in 39 days and the best way to slice a pizza