Product manager resources from product.careers and Ken Norton's Newsletter. For an alternate take, there is good cartoon about effective product management from Henrik Kniberg.
There is also the often useful Google's developer documentation style guide.
NerdRage’s video on the chemistry of etching
The Essential Guide to Electronics in Shenzhen by Bunnie Huang
Speaking of Robot Operating System (we did, briefly), IEEE Spectrum had a nice history of ROS.