Great article, lots of technical details. A simple answer to the 'Why' can be found in the middle under the 'Off Grid Without Batteries' headline.
> If you have a typical grid tied system (microinverters or normal string inverters, so easily 95+% of installed rooftop solar), the system is technically incapable of running off grid (without additional hardware). There's no waveform to sync with,
If you want to teach without leaving the house or standing in front of a group of people, try http://exercism.io/ (Open Source and free).
Solve simple coding problems, review the submissions of others and help them become better coders. Trying to clearly explain concepts to others is the best way to make sure you really know them yourself.
This is also something that you can do for 10-15 min every day, which will add up over time. Ask for feedback on your own solutions and find out ways others think you could improve things.
Current HN Title: 1.7 petabytes and 850M files lost, and how we survived it.
Article title: The largest unplanned outage in years and how we survived it
Article overview:
A month ago CSC's high-performance computing services suffered the largest unplanned outage in years. In total approximately 1.7 petabytes and 850 million files were recovered.
Although technically correct, the HN title is misleading.