Neurons Could Outlive the Bodies That Contain Them
Most of your body is younger than you are. The cells on the topmost layer of your skin are around two weeks old, and soon to die. Your oldest red blood cells are around four months old. Your liver’s cells will live for around 10 to 17 months old before being replaced. All across your organs, cells are being produced and destroyed. They have an expiry date.

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This Is The World’s First Entirely 3D-Printed Gun (Photos) - Forbes
All sixteen pieces of the Liberator prototype were printed in ABS plastic with a Dimension SST printer from 3D printing company Stratasys, with the exception of a single nail that’s used as a firing pin. The gun is designed to fire standard handgun rounds, using interchangeable barrels for different calibers of ammunition.
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Of course, Defcad’s users may not adhere to so many rules. Once the file is online, anyone will be able to download and print the gun in the privacy of their garage, legally or not, with no serial number, background check, or other regulatory hurdles. “You can print a lethal device,” Wilson told me last summer. “It’s kind of scary, but that’s what we’re aiming to show.](http://25.media.tumblr.com/d248a4b11dbb7bf97f663594ef46ceb8/tumblr_mmas6pMtkJ1qz4fj0o1_1280.jpg)


