Overview
Time affects every living thing on Earth. Trees shed their leaves. Some animals only come out at night. There are even insects that only emerge every 17 years. Days, hours, minutes, and seconds – all of these were invented by humans. Humans came up with these units of time to organize their lives and to study the world. One of the first ways humans told time was by noticing the difference between daytime and nighttime. Humans use the Earth revolving around the Sun to divide time into years and seasons. Months are based on the movement of the Moon around the Earth. A day is when the Earth spins completely around its own axis.
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4 - 1Rivers & Streams November 03, 1995 -
4 - 2Nutrition November 10, 1995 -
4 - 3Marine Mammals November 17, 1995 -
4 - 4Earthquakes November 24, 1995 -
4 - 5NTV Top 11 Video Countdown December 01, 1995 -
4 - 6Spiders January 05, 1996 -
4 - 7Pollution Solutions January 12, 1996 -
4 - 8Probability January 19, 1996 -
4 - 9Pseudoscience January 26, 1996 -
4 - 10Flowers January 27, 1996 -
4 - 11Archaeology January 28, 1996 -
4 - 12Deserts January 29, 1996 -
4 - 13Amphibians January 30, 1996 -
4 - 14Volcanoes January 31, 1996 -
4 - 15Invertebrates February 07, 1996 -
4 - 16Heart February 14, 1996 -
4 - 17Inventions February 21, 1996 -
4 - 18Computers April 25, 1996 -
4 - 19Fossils September 05, 1997 -
4 - 20Time September 12, 1997