You walk into a grocery store and pick up eggs. No smartphone? No problem. You swipe your hand across a reader, and the amount is deducted from your bank account. If that sounds far-fetched, you obviously haven’t been to Sweden recently, where thousands of people have reportedly had chips implanted in their bodies. A company called Biohax has already “installed” around 4,000 chips in customers, inserted just below the thumb. They can use the implant to open secure doors, pay for tickets, and share emergency information with medical personnel. The chip is about the size of a Tylenol pill, and...
