25 August 1973 made the first MRI scanner. A device that allows you to explore the structure of the object layer by layer, repeatedly prospecive it in different directions. Tomography is of great importance for medicine, since some of the disease is possible to diagnose only with her. Magnetic resonance imaging provides good contrast between different soft tissues, making it particularly useful in studies of the brain, muscles, heart and cancer diagnostics. Many studies to date, the x-ray device was replaced with a scanner, to reduce the illuminating effect.
Magnetic resonance imaging
August 25, 1989, Voyager 2 sent pictures of Neptune to Earth. Space exploration this unit began in 1977. Neptune was the last planet visited by Voyager 2 it flew 3 000 miles from the North pole of the planet. Studies have been conducted of the atmosphere, magnetosphere, rings and satellites. Voyager 2 has shown that in the atmosphere of distant Neptune are very dynamic processes, although it receives 30 times less sunlight than Jupiter. Voyager 2 discovered six moons of Neptune, but to photograph in detail only managed three. Initially the machine was calculated to study Jupiter and Saturn, but the trajectory provided for the flyby of Uranus and Neptune. In 2015, the craft was at a distance of 16 billion miles from the Sun.
The Neptune unit Voyager 2
25 August 1991, Linus Torvalds introduced Linux. On this day the first version of the kernel was assembled, and then Linus at him ported bash and gcc compiler. About his success of the young Finnish student reported to the postal conference, which was devoted to the operating system minix, which served as a prototype for Linux.
Torvalds himself wrote that his OS is not fit to port it to platforms other than 80386 that his code too closely associated with iron. But, as history has shown, the developer was wrong. Today, Linux is used on a vast number of platforms, there are hundreds of different distributions and kernel code has millions of lines.
Linus Torvalds in his youth