I've read the 'Brief History...' and did enjoy it. As to Ted videos, I have the app on my smart phone and use it when I have to wait for nieces, grandkids, ... a nice 15 minute education or thought provoker.
Before we started RVing we were religiously active, Unitarians, more thought provoking than doctrine. That's mostly gone, though the remnants remain, and Ted now serves the purpose.
Ted is like travel, impossible to see them all.
Between Ted, MOOC and Khan it seems I can spend the year in school. I typically wake up at 5:30 do my exercises and go on the Internet until Ginny gets up at 7:00, We eat out usual, assuming we're stationary spend another hour reading. SOmething to talk about over breakfast.
I bought Ginny a new laptop, a Chromebook $169, a very reasonable price. We both have Chromebooks. Ginny's looks the same as mine except she has dual processors.
The Chromebook has been very tugged, partially because it has no moving parts. I've had mine for a number of years. We have the same phones and computers allowing us to teach each other. The Chromebooks are not super powerful but very Internet adequate, great for writing, reading and education. It's nice how it updates automatically, no requirement to add anti-virus software, and nicely weighs little with long battery
I'm really excited about online education, before RVing I thought about returning to school and studying with no purpose other than gaining knowledge.