1. Áö±¸¿Í ½Ã°£ The earth and time
½Ã°£À̶õ ¹«¾ùÀϱî¿ä? What is ¡®time¡¯?
½Ã°£¿¡ µû¸¥ Áö±¸ÀÇ ³ªÀÌ The geologic age of the earth
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2. »ýü ½Ã°è Biological clock
¿ì¸® ¸ö¿¡ ½Ã°è°¡ ÀÖ¾î¿ä We have biological clocks in our body
½Ã°£¿¡ µû¸¥ ü¿Â º¯È Changes in human body temperature over time
ÀáÀÌ ºÎÁ·Çϸé? What happens if you don¡¯t get enough sleep?
ÀáÀÌ Àß ¾È ¿Í¿ä? Do you have trouble sleeping?
µ¿¹°ÀÇ »ýü ½Ã°è Animals¡¯ biological clocks
½Ä¹°ÀÇ »ýü ½Ã°è Plants¡¯ biological clocks
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