Against overwhelming odds, Royal Air Force pilots fend off the Luftwaffe during the Battle of Britain and ward off German invasion of the British Isles. The Luftwaffe loses 1,733 aircraft and crews.
The Air Force Research Laboratory is offering free licenses for dozens of its patents, including some for secure microchips, 3D-printable “energetic compounds” for use as propellants or explosives, and powerful magnets that are less reliant on rare earth metals. The...

