ما معنى A fiber
ما المقصود بـ A fiber
A fiber
تعنى الألياف العصبية A
وهى تشير إلى أياً من الألياف العصبية المايلنية فى الأعصاب الجسدية بقياس 1 : 22
ميكرون فى القطر
تنتقل المعدلات العصبية بمعدل 6 : 120 متر فى الثانية الواحدة
Learn English From Short Stories "Why Lincoln Grew a Beard?"
Learn English From Short Stories "Why Lincoln Grew a Beard?" Though he wore his beard only four years, today we can hardly think of Abraham Lincoln without it. He often talked about the little girl in West field, New York, who suggested in a letter that he grows the famous the famous beard. Few know the girl’s name, there is no mention of 11-years old Grace Bedell in some of the thickest books published about Lincoln. But he enjoyed telling the story and would add with a quiet chuckle, “Sometimes a small thing can change our lives!” The girl’s advice Grace Bedell sat in her attic room looking at a picture which her father had given her. It was not a drawing and it was not a painting, yet you could see every hair on Lincoln’s head and all the details of his clothing. It was the first photograph Grace had ever seen. It gave her a strange feeling that the tall, lean man himself was looking at her. Grace little lamp threw shadows on the black-and-white pho
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