The U.S. Naval Research Laboratory (NRL) has invented a new way of making transparent spinel, a mineral that is tougher, stronger, harder than glass.
![37-15r_spinel-rectangle_3000x1994[1]](http://alert5.com/wp-content/uploads/2015/04/37-15r_spinel-rectangle_3000x19941.jpg)
U.S. Naval Research Laboratory/Jamie Hartman
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Category: Research
X-37B will test Hall thruster in space
The U.S. Air Force has finally revealed one of the tests it will carry out on board the X-37B.
By USAF [Public domain], via Wikimedia Commons
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Upcoming X-37B flight will test experimental propulsion system
According to the U.S. Air Force Rapid Capabilities Office, the next X-37B flight will test an experimental propulsion system jointly developed by the Air Force Research Laboratory and Space and Missile Systems Center.
By US Air Force [Public domain], via Wikimedia Commons
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Photos of the first ever Autonomous Aerial Refueling by an unmanned aircraft
The X-47B successfully completes the first autonomous aerial refueling demonstration over the Chesapeake bay on Apr. 22.
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South Korea unveils tilt-rotor UAV
The Korea Aerospace Research Institute unveiled its TR-60 unmanned tilt-rotor to the press on Apr. 20.