Primary sources
John Crace rounds-up research news from around the globe, this week: the chimpanzees that have developed their own tool kits
Boiling carrots whole boosts health benefits, researchers find
Medical properties can be enhanced if vegetables are not diced before cooking, experiments show
We’re all getting fatter and it may be contagious, claim economists
Figures since 50s show that obesity could be socially contagious and linked to status
Homeopathy degree suspended after criticism
The undergraduate degree in homeopathic medicine at the University of Central Lancashire has been put on hold after "relentless attacks from the anti-homeopathy league"
Brown gives go-ahead to £500m medical research centre
The prime minister Gordon Brown is to announce the creation of a £500m research centre to tackle health threats such as HIV, meningitis, and cancer
Sore throat virus linked to obesity
A common virus that causes throat and eye infections may also play a role in obesity, according to US scientists.
Medical research head hits back at MPs
The Medical Research Council's chairman has spoken out for the first time against MPs who said he was unfit for his job.
Do moles mean you will live longer?
Aida Edemariam: The answer, according to researchers at King's College, London, is yes.
Watchdog refuses to allow hybrid embryos
· Researchers must now put case for health benefits · Opponents protest at human-animal creation
Hybrid embryo research is legal, regulator says
The possibility of British scientists creating human-animal embryos for medical research moved a step closer today.