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Modern Marvels Season 6 Episode 18

Clocks

Does anybody really know what time it is? Set your clocks as we explore the relativity of time from antiquity–when man attempted to chart time with methods ranging from shadows, candles, and water–to today’s atomic clock system–accurate to within one second every two-million years.

Feb. 22, 1999

6 - 48
Lost MarvelsDec. 14, 1999
6 - 47
Casino TechnologyDec. 13, 1999
6 - 46
Niagara PowerDec. 08, 1999
6 - 45
More Engineering Disasters.Nov. 29, 1999
6 - 44
Security SystemsNov. 16, 1999
6 - 43
MotorcyclesNov. 15, 1999
6 - 42
Emergency RoomNov. 08, 1999
6 - 41
FortsOct. 25, 1999
6 - 40
More Earthmovers.Oct. 18, 1999
6 - 39
The Tool Bench: Hand ToolsOct. 13, 1999
6 - 38
The Tool Bench: Power ToolsOct. 12, 1999
6 - 37
SimulatorsOct. 11, 1999
6 - 36
FireworksSep. 27, 1999
6 - 35
NewspapersSep. 13, 1999
6 - 34
ParachutesSep. 06, 1999
6 - 33
Crash TestingAug. 31, 1999
6 - 32
New York BridgesAug. 23, 1999
6 - 31
Baseball ParksAug. 09, 1999
6 - 30
Hoover Dam.Aug. 02, 1999
6 - 29
Dynamite.Jul. 20, 1999
6 - 28
Offshore Oil DrillingJul. 19, 1999
6 - 27
Scuba And Deep Sea DivingJul. 12, 1999
6 - 26
Rescue EquipmentJul. 06, 1999
6 - 25
U.S. Mints: Money MachinesJun. 21, 1999
6 - 24
Battlefield MedicineMay. 25, 1999
6 - 23
Spy TechnologyMay. 01, 1999
6 - 22
City ParksApr. 26, 1999
6 - 21
Engineering DisastersMar. 30, 1999
6 - 20
Physical FitnessMar. 15, 1999
6 - 19
Airships.Mar. 09, 1999
6 - 18
ClocksFeb. 22, 1999
6 - 17
Mail DeliveryFeb. 08, 1999
6 - 16
StereosJan. 25, 1999
6 - 15
Weather PredictionJan. 01, 1999
6 - 14
ProstheticsDec. 28, 1998
6 - 13
BombsDec. 23, 1998
6 - 12
Extreme Sports GadgetsDec. 16, 1998
6 - 11
Medical ImagingDec. 07, 1998
6 - 10
PlasticsNov. 23, 1998
6 - 9
The Police CarNov. 09, 1998
6 - 8
Antibiotics: The Wonder DrugsNov. 03, 1998
6 - 7
Monumental StatuesOct. 28, 1998
6 - 6
The Oakland Bay Bridge.Oct. 12, 1998
6 - 5
Las Vegas Hotels.Oct. 06, 1998
6 - 4
AquariumsSep. 28, 1998
6 - 3
History of Tall BuildingsAug. 24, 1998
6 - 2
The Atlantic WallAug. 03, 1998
6 - 1
DemolitionJul. 27, 1998