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Japanese army soldier sharing a cigarette with a Soviet Army POW. Khalkhin Gol 1939.

It’s pretty likely that it’s a four digit number, and as there are four digits chosen there, that means that there cannot be any repetition. This mean that there are:

No, no, no. Don’t base your deductions of psychology. Let’s talk chemistry. When you first press a button, there’s more of the natural oils on your skin, and therefore it wears down the numbers on the keys faster. Obviously 0 is the first one, then. Try 0791 first.

The light is green.

After 718 days in orbit, the U.S. Air Force’s X-37b spaceplane landed Sunday morning at Kennedy Space Center. It marked the first time the mini space shuttle landed in Florida, where the Air Force has transferred X-37 operations after three previous landings at Vandenberg Air Force Base in California. OPF-1, one of the three former Orbiter Processing Facilities next to the Vehicle Assembly Building, was transferred to the Air Force in 2014 for use as the X-37′s hangar. Sunday’s landing marked the first time this facility was used by one of the spaceplane’s following an orbital mission. Various aviation notices, activity at the Shuttle Landing Facility, and adjustments in the spacecraft’s orbit since February all hinted at the possibility of the spaceplane’s return. The Air Force gave no prior notice on Sunday’s landing until after the vehicle’s sonic booms were heard across Florida. In the second image above, one of the two declassified payloads is visible, the Aerojet-Rocketdyne XR-5A Hall effect electric thruster.This is the white-capped black cone to the immediate left of the vehicle’s main engine nozzle. Click here to see our coverage of the X-37′s return.