Steve Caplin admires a Singapore company offering electric rental vans. In Denmark, they are developing drones that can recharge from power lines. Japanese scientists are experimenting with drones that can become a rolling wheel on land as well as fly. Hyundai are producing a robot that can deliver tea and post and cope with lifts. A new multitool lets you select the tools you would find most useful. Imperial College has grown a vegan leather shoe from bacteria which even dyed itself. And in Australia, they've found they can retrieve criminals' DNA from air conditioners. Learn more about your ad choices. Visit podcastchoices.com/adchoices