Continuing the theme of the future of humanity, this week we take a look at what we can expect from our towns and cities in the years to come. Will we be living in wooden skyscrapers, amongst crime fighting lampposts or have our own personalised pollution sensors? Plus, in the news, invasive shellfish, the amphibian version of Ebola, making the mind young again, why new brain cells are essential for learning, and advice to brush your teeth to boost your physical fitness...