Harvard researchers unveil new Alzheimer's theory
Researchers at Harvard this week offered a new theory of Alzheimer’s Disease that - if true - would upend our understanding of the disease and suggest new routes for treatment and prevention.
Most Americans Aren’t Middle Class Anymore
Presidential hopefuls from both parties have been saying throughout the primary campaign that the American middle class is in trouble. Bernie Sanders says it is…
The Rolling Stones play to thousands in Cuba in historic concert – in pictures
Free concert expected to attract more than 200,000 people for an event that may go on record as the biggest concert ever seen on the island
Zika: Brazil to deploy army in fight against virus
Brazil says it will deploy troops to go from home to home to inform people about the risks of the Zika virus, which has been spreading in the Americas.