Links

Project Gutenberg
Public domain eBooks
indieseek.xyz
A human-edited directory of independent websites
LibriVox
Public domain audiobooks
Wikisource
Open-source books
The Sagulator
Calculation of shelf sagging for different wood types and shelf configurations.
NASA Fastener Design
The reason I hate split lock washers.
- Fastener Design Manual Far more information than you really need about attaching things together.
- Fastener Design Course A series of video lectures on the topics in the manual.
Trebuchet Mechanics
I found the 2001 version of this paper when in highschool (2005/2006). I didn’t understand much of the math then, but I still wanted to build one (I didn’t).