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quality control

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Build a Do-It-Yourself Air Purifier for About $403:40

Build a Do-It-Yourself Air Purifier for About $40

2.3M views • 15 years ago
Michigan Medicine
A University of Michigan Medicine demonstration of building a cheap DIY air purifier from a box fan and a HEPA or high-MERV filter using hardware-store parts. It explains why this helps against dust, smoke and viruses and ties it to local air quality readings.
[OUTDATED 2018 INSTRUCTIONS] HOW TO USE THE WINDSHIELD WIPERS // TESLA MODEL 32:16

[OUTDATED 2018 INSTRUCTIONS] HOW TO USE THE WINDSHIELD WIPERS // TESLA MODEL 3

99K views • 8 years ago
Lexi Heft
A 2018 vlog showing how to use the windshield wipers on a Tesla Model 3, including auto mode, manual settings and voice commands. It is labeled outdated.
Emacs Rocks! Episode 14: Paredit3:25

Emacs Rocks! Episode 14: Paredit

65K views • 13 years ago
emacsrocks
A three-minute Emacs Rocks screencast by Magnar Sveen demonstrating paredit, which edits Lisp code structurally as a tree of s-expressions rather than characters.
Topic match · Testing, debugging & developer tools