First flight of the Wright Flyer I, December 17, 1903, Orville piloting, Wilbur running at wingtip. (Photo credit: Wikipedia)
"In 1878, when Orville and Wilbur were ages 7 and 11, their father brought them a toy "helicopter." It was based on an invention by French aeronautical pioneer Alphonse Penaud. Made of cork, bamboo, and paper, with a rubber band to twirl its twin blades, it was a little bigger than an adult's hand. They later said this sparked their interest in flight. During the next few years, Wilbur and Orville tried to build these themselves, but the bigger they made them the less well they flew. Somewhat discouraged, the brothers turned to kites."
Human Ancestor ‘Little Foot’ Lived 3.7 Million Years Ago | TIME : "New research indicates that a mysterious skeleton dubbed “Little Foot” lived around the same time as human ancestor Lucy’s species, suggesting a diverse landscape of pre-humans in Africa during the same period."
6174 (number) - Wikipedia, the free encyclopedia : "6174 is known as Kaprekar's constant[1][2][3] after the Indian mathematician D. R. Kaprekar. This number is notable for the following property: Take any four-digit number, using at least two different digits. (Leading zeros are allowed.) Arrange the digits in ascending and then in descending order to get two four-digit numbers, adding leading zeros if necessary. Subtract the smaller number from the bigger number. Go back to step 2. The above process, known as Kaprekar's routine, will always reach its fixed point, 6174, in at most 7 iterations.[4] Once 6174 is reached, the process will continue yielding 7641 – 1467 = 6174"
Comments
Post a Comment