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Date: 6-11-2016
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Date: 1-11-2016
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Date: 25-10-2016
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Grain of Sand
If the atoms in a grain of sand were laid out side by side in a line, approximately how long would the line be?
Answer
If one assumes that the grain of sand has a diameter that is a reasonable fraction of 1 millimeter, then the line of atoms would be about 1010 meters long, about thirty times the distance to the Moon!
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دراسة تكشف "مفاجأة" غير سارة تتعلق ببدائل السكر
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أدوات لا تتركها أبدًا في سيارتك خلال الصيف!
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العتبة العباسية المقدسة تؤكد الحاجة لفنّ الخطابة في مواجهة تأثيرات الخطابات الإعلامية المعاصرة
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