Where DO screws come from?
19:54
The HIDDEN Screws of PRECISION
38:01
Watchmaking: Machining the Heart of a Watch
30:33
Origins of Precision
16:48
Making Square Holes - Three Ways
26:49
The most important screws EVER MADE!
16:48
The EXPLOSIVE Discovery of Nitroglycerin (the History of Dynamite)
18:43
The Surprising Genius of Sewing Machines
29:02