What are the tropics? Detailed answer

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What are the tropics? Detailed answer

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What are the tropics?

These are parallels on both sides of the equator, at a distance of 23° 27' from Him to the north and to the south. The northern one is called the Tropic of Cancer, the southern one - Capricorn, since on June 22 the Sun is at its zenith above the northern tropic, being in the constellation of Cancer, and on December 22 - above the southern one, being in the constellation of Capricorn.

Author: Mendeleev V.A.

Random interesting fact from the Great Encyclopedia:

What animals are able to remove foreign objects from their body through the bladder?

Frogs are able to remove foreign objects from their bodies through their bladders. This discovery was made by Australian scientists by accident. During the experiments, they implanted transmitters into the bodies of frogs. A few weeks later, the frogs were caught and found that most of the devices had moved into the bladders, and some came out with the urine. It turned out that when a foreign body appears, soft tissues begin to grow to it, which gradually envelop the object and draw it into the bladder.

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Nanorobot Generator 12.06.2007

US scientists have made a device that can power a nanorobot.

About a year ago, professor at the Georgia Institute of Technology (USA) Tsong Ling Wang proposed creating electricity generators for nanorobots using zinc oxide nanowires. This year, scientists under his leadership managed to realize the idea and make a prototype of a generator capable of delivering direct electric current. According to calculations, one cubic centimeter of such a generator can produce a huge voltage for a nanorobot - up to 4 V.

The generator is set up like this. Thousands of zinc oxide nanowires half a micron long have been grown on a gallium arsenide substrate. Between the wires and the substrate is a layer of zinc oxide - it collects electricity. And the second electrode consists of silicon oxide, on which thousands of bumps are grown, forming zigzag lines.

These tubercles are covered with platinum and are capable of conducting current. Under the action of vibration, the nanowires, firstly, generate electricity due to the piezoelectric effect, and secondly, their tips oscillate and close to the tubercles of the second electrode. This creates an electric current in the circuit.

According to the authors of the work, the generator will be useful for powering medical sensors implanted in the human body, and for autonomous sensors that monitor the state of the environment, and for hypothetical nanorobots, as well as for strengthening US defense.

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