Doctors at Massachusetts General Hospital have successfully grown a rat leg in a petri dish, and it could change prosthetics forever. Eventually, this technology could allow for human hand, arm, and leg transplants without the risk of the patient's body rejecting the new limb. Read more: http://goo.gl/72AYWq Subscribe to our channel! http://goo.gl/0bsAjO Vox.com is a news website that helps you cut through the noise and understand what's really driving the events in the headlines. Check out http://www.vox.com to get up to speed on everything from Kurdistan to the Kim Kardashian app. Check out our full video catalog: http://goo.gl/IZONyE Follow Vox on Twitter: http://goo.gl/XFrZ5H Or on Facebook: http://goo.gl/U2g06o