ã‚¢ãƒãƒãƒ»ãƒãƒ“ãƒ³ã‚¹: æ³¨æ„ã‚’ãã‚‰ã™ãƒ†ã‚¯ãƒ‹ãƒƒã‚¯ | TED Talk | TED.com - mobile hack æ¥½ã—ã„ç”Ÿæ´»æƒ…å ±ã‚’æºå¸¯ã