World's first test tube burger tasted in London

Scientists on Monday unveiled the world's first lab-grown beef burger, serving it up to volunteers in London in what they hope is the start of a food revolution. The 140 gramme (about five ounce) patty, which cost more than 250,000 euros ($330,000) to produce, has been made using strands of meat grown from muscle cells taken from a living cow. Duration: 00:58