Yes, in the summer time if you cross over the Arctic Circle it doesn't get dark with a sunset for one night and at the north pole it is light for 6 months (summer) then dark for 6 months (winter).
The same thing happens when you head to the south pole in the Southern Hemisphere.
That is true only from the March equinox until the September equinox. The opposite is true during the other half of the year.
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The longer the henna is in contact with the skin the more lawsone will stay. making the henna paste sticky with sugar will keep it on the skin longer so more color will take.
Light bulbs have affected our lives in many positive ways!! One way is we no longer have to use candles, I'm pretty sure that has caused less fires! Another way is we can stay up and work for as long as we want because, unlike the ancient Romans we no longer have to depend on the sun's light to work. The light bulb was a wonderful creation that will most likely always be used for many generations to come. It is one of those inventions that will never need improvement!
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Old satellites orbiting near the Earth eventually fall back into the atmosphere and burn. Satellites orbiting farther away stay in orbit indefinitely.