Extras

NOVA

Earth from Space Preview

Preview: S40 Ep6 | 50s

Detailed satellite images reveal the web of connections that sustain life on Earth.

NOVA

The Looming Satellite Gap

Clip: S40 Ep6 | 1m 51s

Many Earth-observing satellites are nearing the end of their lives.

NOVA

The Volga Trade Route

Clip: S40 Ep6 | 2m 58s

The Vikings may have trekked all the way to Iran in search of crucible steel.

NOVA

When Hurricane Sandy Went Rogue

Clip: S40 Ep6 | 2m 6s

What started out as a tropical storm evolved into one of New York City’s worst nightmares.