I thought it needed a couple more lines, for the 21st century

 The three I know are:

Those who can, do.
Those who can't, teach.
Those who can't teach, become critics.

And my additional lines:

Those whose criticism is useless, become Democrat elected officials.
Those who can't become Democrat elected officials (without time in training), become "community organizers" and "activists".

Low batteries in the morning

I added a mobile freezer to the mobile refrigerator already in the solar power mobile testbed the other day, and then someone called with a problem in Oakland, so I didn't put the (temporary, test) panels up much that day. The next day, I had errands to run, so I put up only the two thin, light panels, thinking I would go out in the morning. But, things happened, so I didn't get out until afternoon, and when I got back, not much sun was left, so, even though I added two more panels (which weigh twice as much, but produce more power), the batteries were still low in the evening.

This morning, I woke up a little before 5 (there was a low battery alarm beeping, softly beeping, on my remote monitor). So, there I was, out in the parking lot behind my office, before dawn, connecting my last emergency reserve battery, and looking at the predawn sky, when I thought of:

I Can See Clearly Now

Then, Google AI "suggested", that is the word, sir, "suggested":

Creedence Clearwater Revival - Have You Ever Seen The Rain (Official)

And then, of course,

Billy Joel - Piano Man (Official Music Video)

And,

Billy Joel - Just the Way You Are (Official Audio)

Then, GoogleAI "suggested" something silly (it has no understanding, you know), so I looked up:

The Rolling Stones - You Can’t Always Get What You Want (Official Video) [4K]