TV Bill Nye the Science Guy - Season 4 Episode 20 : Time Bill Nye the Science Guy - Season 4 Episode 20 : Time 7.337/10 by 89 users 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. Details Casts Posters Images Title Bill Nye the Science Guy - Season 4 Episode 20 : Time Alternative Titles 比尔教科学, Bill Nye, the Science Guy First Air Date 1993-09-10 Last Air Date 1998-06-20 Number of Episodes 100 Number of Seasons 5 Genres Comedy, Documentary, Kids, Networks PBS, Casts Bill Nye, Rachel Glenn, Jennifer Lin, Amy Broder, Ethan Ferkiss Plot Keywords , Self - Host Bill Nye Nancy Rachel Glenn Jennifer Lin Amy Amy Broder Smell Gibson Ethan Ferkiss Episodes List Bill Nye the Science Guy Season 4 :Episode 1 Rivers & Streams Rivers & Streams 1995-11-03 It's "Mr. Wizard" for a different decade. Bill Nye is the Science Guy, a host who's hooked on experimenting and explaining. Picking one topic per... Bill Nye the Science Guy Season 4 :Episode 2 Nutrition Nutrition 1995-11-10 It's "Mr. Wizard" for a different decade. Bill Nye is the Science Guy, a host who's hooked on experimenting and explaining. Picking one topic per... Bill Nye the Science Guy Season 4 :Episode 3 Marine Mammals Marine Mammals 1995-11-17 It's "Mr. Wizard" for a different decade. Bill Nye is the Science Guy, a host who's hooked on experimenting and explaining. Picking one topic per... Bill Nye the Science Guy Season 4 :Episode 4 Earthquakes Earthquakes 1995-11-24 It's "Mr. Wizard" for a different decade. Bill Nye is the Science Guy, a host who's hooked on experimenting and explaining. Picking one topic per... Bill Nye the Science Guy Season 4 :Episode 5 NTV Top 11 Video Countdown NTV Top 11 Video Countdown 1995-12-01 It's "Mr. Wizard" for a different decade. Bill Nye is the Science Guy, a host who's hooked on experimenting and explaining. Picking one topic per... Bill Nye the Science Guy Season 4 :Episode 6 Spiders Spiders 1996-01-05 It's "Mr. Wizard" for a different decade. Bill Nye is the Science Guy, a host who's hooked on experimenting and explaining. Picking one topic per... Bill Nye the Science Guy Season 4 :Episode 7 Pollution Solutions Pollution Solutions 1996-01-12 It's "Mr. Wizard" for a different decade. Bill Nye is the Science Guy, a host who's hooked on experimenting and explaining. Picking one topic per... Bill Nye the Science Guy Season 4 :Episode 8 Probability Probability 1996-01-19 It's "Mr. Wizard" for a different decade. Bill Nye is the Science Guy, a host who's hooked on experimenting and explaining. Picking one topic per... Bill Nye the Science Guy Season 4 :Episode 9 Pseudoscience Pseudoscience 1996-01-26 It's "Mr. Wizard" for a different decade. Bill Nye is the Science Guy, a host who's hooked on experimenting and explaining. Picking one topic per... Bill Nye the Science Guy Season 4 :Episode 10 Flowers Flowers 1996-01-27 It's "Mr. Wizard" for a different decade. Bill Nye is the Science Guy, a host who's hooked on experimenting and explaining. Picking one topic per... Bill Nye the Science Guy Season 4 :Episode 11 Archaeology Archaeology 1996-01-28 It's "Mr. Wizard" for a different decade. Bill Nye is the Science Guy, a host who's hooked on experimenting and explaining. Picking one topic per... Bill Nye the Science Guy Season 4 :Episode 12 Deserts Deserts 1996-01-29 It's "Mr. Wizard" for a different decade. Bill Nye is the Science Guy, a host who's hooked on experimenting and explaining. Picking one topic per... Bill Nye the Science Guy Season 4 :Episode 13 Amphibians Amphibians 1996-01-30 It's "Mr. Wizard" for a different decade. Bill Nye is the Science Guy, a host who's hooked on experimenting and explaining. Picking one topic per... Bill Nye the Science Guy Season 4 :Episode 14 Volcanoes Volcanoes 1996-01-31 It's "Mr. Wizard" for a different decade. Bill Nye is the Science Guy, a host who's hooked on experimenting and explaining. Picking one topic per... Bill Nye the Science Guy Season 4 :Episode 15 Invertebrates Invertebrates 1996-02-07 It's "Mr. Wizard" for a different decade. Bill Nye is the Science Guy, a host who's hooked on experimenting and explaining. Picking one topic per... Bill Nye the Science Guy Season 4 :Episode 16 Heart Heart 1996-02-14 It's "Mr. Wizard" for a different decade. Bill Nye is the Science Guy, a host who's hooked on experimenting and explaining. Picking one topic per... Bill Nye the Science Guy Season 4 :Episode 17 Inventions Inventions 1996-02-21 It's "Mr. Wizard" for a different decade. Bill Nye is the Science Guy, a host who's hooked on experimenting and explaining. Picking one topic per... Bill Nye the Science Guy Season 4 :Episode 18 Computers Computers 1996-04-25 It's "Mr. Wizard" for a different decade. Bill Nye is the Science Guy, a host who's hooked on experimenting and explaining. Picking one topic per... Bill Nye the Science Guy Season 4 :Episode 19 Fossils Fossils 1997-09-05 It's "Mr. Wizard" for a different decade. Bill Nye is the Science Guy, a host who's hooked on experimenting and explaining. Picking one topic per... Bill Nye the Science Guy Season 4 :Episode 20 Time Time 1997-09-12 It's "Mr. Wizard" for a different decade. Bill Nye is the Science Guy, a host who's hooked on experimenting and explaining. Picking one topic per...