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Bernard English

Bernard English
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Native Speaker of American English Conversation practice. Chatting or in-depth discussion of news articles. TOEFL-IELTS practice / CV, SOP, journal paper, essay revision 英語家教 彈性排課, 免通勤, 托福, 職場英文, 履歷/論文修改…等。 請看我的學生推薦信。

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Sunday, April 10, 2011

Stress and ageing FROM The Economist

"Unlike shoelaces, though, chromosomes replicate themselves from time to time as the cells they are in divide. This shortens the telomere and, after 50-70 such divisions (a number known as the Hayflick limit, after its discoverer), a chromosome can grow no shorter and the cell it is in can divide no more."

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