15. Song of the Sea

A strange sound prompts an incredible discovery.

• 14 mins

16. A Drop in the Ocean

How do you find a single man lost at sea?

• 16 mins

17. The Golden Spike

With an angry outburst at a conference, one scientist ignites a multi-decade quest

• 15 mins

18. The Night the Earth Shook

After months of mild quakes, a sudden tremor alarms an Italian city. What will follow?

• 17 mins

19. A Different Kind of Justice

How does a small informal survey lead to shocking truths about the US justice system?

• 14 mins

20. The Confidence Trick

A finance manager sports a perfect graph. Is it a fluke or something sinister?

• 17 mins