The First Telephone
18:56
Why The First Computers Were Made Out Of Light Bulbs
22:27
I BUILT my own TELECOMMUNICATIONS Network!
13:13
How Was Video Invented?
10:34
The Telephone - How It Works
6:24
The history of the telephone
19:03
Things you can make from old, dead laptops
10:46
The Engineering behind Electric Kettles
4:01