Helmet cameras allow you to capture shots that would be impossible otherwise. What's it like to see a wave coming at you while you surf? But the camera has uses way beyond extreme sports. Who else has jumped on the trend beside athletes?
When deceased rapper Tupac appeared alongside Snoop Dogg at Coachella, the Internet lit up with talk of holograms. But there was no hologram. How did computer animation and a 19th-century theatrical trick create the illusion?