How to Calculate Time With an Islamic Astrolabe

Season 50 Episode 2

About the Episode

The instrument only requires the observation of the sun’s position to begin making calculations.

Aired: | Expires: | Runtime: 2m 38s

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How Sewage Becomes Drinking Water

How do you make wastewater drinkable? It starts at the sewage treatment plant.

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How the West Is Making It Rain, With Science

A method of boosting snow and rainfall may help ease drought conditions in the western US.

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There’s Something Living in Wildfire Smoke

Wildfire smoke can carry harmful microorganisms long distances.

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How Extreme Heat Overwhelms the Human Body

When it comes to extreme weather, heat can be a “silent killer.”

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Chasing Carbon Zero Sneak Peek

A new film from NOVA examines technologies that could get us to carbon zero by 2050.

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Soothing Science: The Light You See at Sunset

Relax to the sound of the ocean and discover the science behind sunsets.

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Saving the Right Whale Preview

Follow scientists determined to save the critically endangered right whale.

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Chasing Carbon Zero Preview

Here’s how the U.S. could reach net-zero carbon emissions by 2050.

0:29
Ancient Pyramids Uncovered in the Amazon

This discovery rewrites the history of complex societies on the continent.

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Manhattan Schist

All over the city you can see outcrops of bedrock. It’s called Manhattan schist.

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