Where does the people live, all of whose representatives have the same blood type? Detailed answer

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Where does the people live, all of whose representatives have the same blood type? Detailed answer

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Where does the people live, all of whose representatives have the same blood type?

The Bororo Indian people live in Brazil and Bolivia in the amount of about 1600 people. The unique feature of this tribe is that all Bororos share the same blood type, the first.

Thus, each of them can become a donor to a tribesman.

Authors: Jimmy Wales, Larry Sanger

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Why do insects hit lamps?

Insects navigate in flight around the world. They fix the source - the Sun or the Moon - and maintain a constant angle between it and their course, taking a position in which the rays always illuminate the same side. However, if the rays from the heavenly bodies are almost parallel, then from an artificial light source the rays diverge radially. And when the insect chooses a lamp for its course, it moves in a spiral, gradually approaching it.

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Cotton as a semiconductor 05.03.2004

Uzbek physicists have discovered that cotton fiber has the properties of a semiconductor: it greatly changes its electrical conductivity under the influence of external factors. In principle, this makes it possible to create electronic elements based on cotton.

Cleaned and combed cotton fibers in bunches of about 7000 pieces were impregnated with a 10% iodine solution, and then dried at 50 degrees Celsius. It turned out that such a beam, if an electrical voltage is applied to its ends and illuminated with ultraviolet light, changes the electrical conductivity by 12-50 times.

Silicon doped with some impurities behaves in approximately the same way. When illuminated with ordinary white light, the behavior of the fiber is more complicated: the electrical conductivity first falls, after a while it becomes higher than the original, and in the dark after a few hours it is restored to normal.

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