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    GREGIGregiho vizuální postřehy a obrázky+videa co mě baví
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    Goubbet al Kharab, Djibouti, Africa
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    When very high voltages are applied to water in two adjacent beakers, they spontaneously form a “water bridge”. It’s a phenomena that, despite being known for more than 100 years, is not completely understood to this day. It is thought that the extreme voltages, in the thousands of volts, are able to pull the positive and negative charges of the water apart in a way that the thread can overcome gravity.

    Water Bridge - Formation - YouTube
    http://www.youtube.com/watch?v=AhHJ-SovtZ0
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    nejlepsi lustr!

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    Nature’s Night Lights

    Sometimes known as the sea-firefly, Vargula hilgendorfii is a species of ostracod crustacean that only inhabits coastal waters off Japan. It is a nocturnal creature that rarely grows longer than 3 millimeters, with a beautiful transparent shell—but it’s best known for its bioluminescence. When disturbed, it secretes a luminous blue substance through a process similar to many other bioluminescent creatures: a chemical reaction of the substrate luciferin and the enzyme luciferase. The maximum wavelength of its light depends on the pH and the salinity of the water, and varies between 448 and 463 nanometers—meaning that the light is colored various shades of blue

    In World War II, the Japanese collected these creatures and crushed them in sand and water to produce their blue luminescence, which ingeniously served as light for soldiers to read maps and messages at night.



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