Putting a computer in your brain is no longer science fiction

Like many in Silicon Valley, technology entrepreneur Bryan Johnson sees a future in which intelligent machines can do things like drive cars on their own and anticipate our needs before we ask. What's uncommon is how Johnson wants to respond: Find a way to supercharge the human brain so that we can keep up with the machines. From an unassuming office in Venice Beach, his science-fiction-meets-science start-up, KerNEL, is building a tiny chip that can be implanted in the brain to help people suffering from neurological damage caused by strokes, Alzheimer's, or concussions. The team of top neuroscientists building the chip -- they call it a neuroprosthetic -- hope that in the longer term, it will be able to boost intelligence, memory, and other cognitive tasks. The medical device is years in the making, Johnson acknowledges, but he can afford the time.