13 people killed after a van is driven into crowds in Barcelona. How do we keep our cities safe from these kinds of attacks?
Why do humans have different bloodtypes. Is there an evolutionary reason?
Qualification: Professor of the Public Understanding of Science at the University of Brighton
Answer: There’s no evolutionary benefit to having a particular blood group. You could just as easily ask why we have green eyes or blue eyes or brown eyes. In terms of evolution, blood group AB is a universal receiver whereas blood group O is a universal donor. Therefore, if having a certain blood group was of evolutionary benefit, we would all be AB.