How Do They Do It?

Season 9 Episode 8: Suspension Bridge, Crossbows

How do they make steel cables strong enough to hold up a 50,000 tonne bridge; why do modern hunters use medieval weapons; and how do shops know which clothes sizes...

Genre:

Documentary

Seasons:

17

Episodes:

287

Quality:

HD

Status:

Returning Series

First Air:

2006

IMDb:

7.6