How Do They Do It?Stream It

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...
Aired: Aug 23, 2012 Genre: DocumentaryDuration: 22m Rating: 0 Country: Canada, Singapore, United Kingdom, United States of America Production: WAGtv