by Drew Halley Yet another sci-fi milestone is upon us: microchips implanted under your skin and used to identify you. The VeriChip is the first radio-frequency identification (RFID) microchip that’s been approved by the Food and Drug Administration for use in humans. The chip is the size of a long grain of rice, and can be implanted pretty much anywhere in the body (most commonly along the tricep). Depending on how it’s used, the chip could do anything from telling doctors your medical bac