2,121,106 views
20 hours ago
305,351 views
7 months ago
991,360 views
2 years ago
309,890 views
9 months ago
Show more
925,427 views
17,199
0
Numberphile
4.48M subscribers
Tags
phone
Human Factors And Ergonomics (Exhibition Subject)
human factors
bell
telephone
1700 Comments