They represent power, they can generate fear, but why do we have secrets?
Forensic DNA matching could help identify victims of Typhoon Haiyan
Is your information safe? Professor Matthew Green explains the weaknesses in encryption
Prof Jenny Graves on the evolution of sex genes from fauna to the male Y chromosome
Why do some people have a darker outlook on life while others have a brighter one?
Meteors of similar size to the Chelyabinsk event may strike Earth more frequently
A from report Kigali on how technology is transforming Africa
Jim al-Khalili discusses digging up dinosaurs in remote places with Professor Mike Benton
Researchers have found strong evidence that the SARS virus originated in bats
How different cultures define telling the truth