Be careful who you insult on Twitter. They might retaliate like Elon Musk. Plus, why short-sightedness is growing, funny questions to ask Siri, how to control your TV with your voice, the biggest AI fails, iris-scanning tech is coming to more devices and the shocking story behind Amazon's suicide kits. Also, don't leave old phones lying around. They could catch fire! Learn more about your ad choices. Visit megaphone.fm/adchoices