Seven-year-old Faith Lennox never thought she needed a left hand. She couldn't remember losing hers. But when it came to getting one made in a day by a 3-D printer, that was different.
Threats against schools don't just come written on bathroom walls these days. Spread using apps and social media, anonymous threats of violence are forcing responses by police and other authorities.
In "most cases," the content-sharing app Snapchat says it deletes messages from its servers after recipients have viewed them. But one of the exceptions is when police or authorities come calling.
Social media tech giant Facebook users are already used to seeing more videos filling their news feeds. Now the company is doubling down on the medium by introducing a video app called Riff.
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