Where DO screws come from?

VIDEO HERE  (18:32 minutes)

0:00 Introduction

0:54 Waterscrews

1:48 Fruit presses

4:08 Worm Drive

5:24 Internal thread cutting

7:19 Dioptra

7:50 Armor screws

8:17 Screws vs bolts

9:01 Armor part II

9:26 Early screw drivers

9:47 Medieval House book

13:01 Löffelholz Kodex

15:22 Ediphone

17:31 Conclusion