善良的小蛦2在钱免费观看

　　Hannah Fry uncovers the secrets behind the miraculous technologies of the modern world, revealing the mind-blowing stories behind their invention. 　　Episode 1: Bank Card 　　Hannah Fry takes a look at the bank card. This humble piece of plastic is often taken for granted, but it's the digital key to accessing cash and is packed full of extraordinary technological innovations. 　　Episode... (展开全部)