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Cannabis oil has come under scrutinyRUNGROJ YONGRIT/EPA-EFE/REX/ShutterstockBy Alison GeorgeCannabis is in the headlines for its potential medical benefits after the recent confiscation of cannabis oil medication from the mother of a 12-year-old British boy with severe epilepsy. The furore that ensued is shining a light on campaigns for cannabis oils to be made legal for medical reasons, and the UK government has now announced a review into the use of medicinal cannabis. Here’s what you need

The herpes virus HHV-6 has been found in the brain of people with Alzheimer’s disease.National Cancer Institute/SCIENCE PHOTO LIBRARYBy Sam WongThe most in-depth analysis of human brain tissue ever done in Alzheimer’s disease has found evidence for the controversial theory that viruses play a role in the condition. If true, it could mean that some instances of Alzheimer’s might be treated with anti-viral drugs. Alzheimer’s is the most common cause of dementia, affecting some 47 million