How Earth’s Climate Changed Over the Past 500 Million Years
Season 47
Episode 1
About the Episode
Over its history, Earth has fluctuated between two climate states: Icehouses, with ice caps at at least one of the poles, and Hothouses, when there is no ice at the poles.
Aired:
| Expires: | Runtime: 3m 25s
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Extras
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Critical Condition: Health in Black America Preview
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Investigate medical algorithms in which the patient’s race drives decisions.17:19 -
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UFO Sightings: How Scientists are Trying to Capture More Data
To better study the UFO phenomenon, science needs more eyes on the skies.5:00
