Which is a winning combination of digits?
[7410] Which is a winning combination of digits? - The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot. - #brainteasers #mastermind - Correct Answers: 9
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Which is a winning combination of digits?

The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.
Correct answers: 9
#brainteasers #mastermind
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Emergency Landing

At 8 p.m. one night, a pilot who had run out of fuel made an emergency landing at a top-secret government base. He was quickly surrounded by security and taken inside to be interrogated. The interrogation was grueling because they wanted to make sure it was an unplanned landing and he was not a spy.
The interrogation lasted all night. At 6 a.m. they refueled his plane and let him go with his promise never to return. Four hours later he returned and landed again.
Security met him on the runway. They asked him why he had come back.
'I know I promised never to return but I brought my wife and now you have to tell her where I was all night...'

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Rock drill patent

In 1851, James W. Fowle was issued he first U.S. Patent for a direct-action percussion rock-drill (No. 7,972). He had filed a caveat in 1849, about two months after Joseph J. Couch received a patent for the first steam-powered percussion rock-drill. In Couch's design, the drill bar was not fastened to the piston head, but at each stroke was alternately caught, drawn back and thrown against the rock, like a lance. Both employed steam power. At first, Couch and Fowle had collaborated, but Fowle separated to pursue his own design, which is the real precursor of the drills developed in the following decades. To employ the direct action on the drill-bar Fowle had to solve the problem of how to avoid damage to the piston cylinder. He used compressed air to drive his“S” shaped drill.«
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