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[00:01.00]SARAH LONG:Scientists have tried for a long time to invent a human-like machine.
[00:07.87]Devices that can operate themselves and do some things humans can do are called robots.
[00:17.14]Now,Stuart Wilkinson has invented a robot that can eat food.
[00:23.75]This food is used to produce energy that the robot needs to work.
[00:30.18]It is the first robot to be completely powered by food.It is called a gastrobot.
[00:39.32]Mister Wilkinson works at the American University of South Florida in Tampa.
[00:46.50]He has named his gastrobot Chew Chew.The robot has twelve legs and looks like a train.
[00:55.80]It has three parts.Each part is a meter long.Chew Chew's stomach is a device that uses bacteria to break down food.
[01:08.97]The bacteria,E,Coli,produce substances called enzymes,which can break down carbohydrates.
[01:18.27]The process releases electrons that are used to power a battery.
[01:24.54]In this way,chemical energy is used to produce electricity.Humans get energy from food in a similar way.
[01:35.38]BOB DOUGHTY:The inventor says the gastrobot is only being fed sugar right now.
[01:41.99]This is because the bacteria break down almost all the sugar and produce very little waste.
[01:49.95]The only waste produced is carbon dioxide gas and water.Chew Chew can also eat vegetables.
[01:59.78]Scientists say the first versions of such a robot could be used to cut grass,for example.
[02:07.98]The robot could power itself with the grass it is cutting.
[02:12.81]Mister Wilkinson hopes to improve the design of the robot so that it can feed itself.
[02:20.52]In the future,scientists hope to invent robots that can produce enough energy to power a car or a train.
[02:31.85]Another idea is an underwater robot that could eat fish.
[02:37.60]Mister Wilkinson says a gastrobot eating meat would produce the most energy.
[02:44.78]However,he says it might be dangerous to give robots their first taste of meat.
[02:52.41]They might realize that humans are meat and can be eaten too.
