3. Though bionic legs are of course a huge boon to amputees, they lack actual nerve connections with the body. As a result, walking on them is cumbersome and tiring. But last year, Seattle resident Zac Vawter was outfitted with the world's first thought-controlled leg, a bionic limb that takes signals directly from his mind.
4. Although no North American cities feature in the top 20, the EIU said the cost of living in New York had risen relative to other places in the United States. It shares 27th position as the most expensive US city with Los Angeles.