Uzi maalum wa kupeana Likes: Comment chochote upate "Like"

Uzi maalum wa kupeana Likes: Comment chochote upate "Like"

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446. Why are local disks in computers labelled with alphabets C, D, E and not with A and B?

Have you seen a floppy? Floppies were a type of disk storage used earlier, before the current system of storage came into existence. Floppy disk drives were named with the letters A and B. When hard disk drives became standard in most computers, they were logically labelled 'C' since the first two letters were already used for these floppy drives. Though floppy disk drives are no longer widely used, hard disks are still labelled from 'C' onwards.
 
444. How was pregnancy tested back then?

Ancient Egyptians mixed the urine with grains. At least, they
knew where to look at. In the middle ages, urine samples were mixed with alcohol.
The samples were also analysed based on colour. Around the 19th century, focus
was on structures seen under the microscope. Early 20th century, they injected the tested urine into rabbits. Early 60s, they reacted antibodies
with the samples. It had a lot of false positive results.
Presently, blood and urine samples are tested for levels of a specific hormone hCG
(human chorionic
gonadotropin). This is the most reliable of the bunch.
 
443. Why do various planets appear to be of different colours?

Each planet has a different colour, because of its unique compositions. Mercury is grey. Since this planet has no atmosphere, we see only the dark rocky surfaces with plains, craters and ridges like those on the Moon. Venus is yellowish white due to the thickness of is colourless sulphuric acid clouds. Mars, the red orange planet is covered with a red dust of iron oxide. It has some spectacular features like volcanoes and enormous mountains. Jupiter has white and orange bands. Ammonia clouds cause the white bands, while orange is due to the ammonium hydrosulphide clouds. The north of Saturn is blue and the south, pale yellow. The ring around the planet blocks the Sun's rays from reaching the northern half. Uranus and Neptune appears light blue due to the methane clouds. Neptune is slightly darker blue because of its great distance from the sun. When watched from space Earth appears to be light-blue with white patches of clouds.
 
442. What is Blue Brain Technology ?

The Blue Brain, a Swiss national brain initiative, aims to create a digital reconstruction of the brain by reverse engineering mammalian brain circuitry. The mission of the project, founded in May 2005 by the Brain and Mind Institute of the École Polytechnique Fédérale de Lausanne (EPFL) in Switzerland, is to use biologically-detailed digital reconstructions and simulations of the mammalian brain (brain simulation) to identify the fundamental principles of brain structure and function in health and disease.
 
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