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Do You Know
Questions & Answers on General Knowledge.

Where does the Sun shine the most?
In the United States, Yuma, Arizona has a yearly average of 90 percent of sunny days, or more than 4,000 sunny hours per year. St. Petersburg, Florida, is a close second; that city had 768 consecutive sunny days from February 9, 1967 to March 17, 1969. If you were to travel, you would find the eastern end of the Sahara Desert in North Africa the sunniest—the Sun shines there 97 percent of the time.
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  • Precaution while using Microscope


    USING THE CONDENSER FOCUS ADJUSTMENT KNOB THAT IS LOCATED ON THE LEFT SIDE OF YOUR MICROSCOPE JUST BELOW THE STAGE, MOVE THE CONDENSER UP TOWARD THE STAGE AS FAR AS IT WILL GO. Optical and electron microscopy involve the diffraction, reflection, or refraction of electromagnetic radiation/electron beams interacting with the specimen, and the subsequent collection of this scattered radiation or another signal in order to create an image. This process may be carried out by wide field irradiation of the sample (for example standard light microscopy and transmission electron microscopy) or by scanning of a fine beam over the sample (for example confocal laser scanning microscopy and scanning electron microscopy).

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