I mailed him about some completely random bullshit something like 20 years agoAnd he actually replied a couple days later (even if with only a short sentence)
Pretty sure the charity actually does decent workBut yeah, it's basically a way to clear his name in the history records
The closest one I know of is the one that you mentionedBut even they have big drawbacks (slow and very bulky)
Omnidirectional treadmillThere are several companies working on them or even selling them. But they all suck in different ways or are not something that can be used or bought by an average user
They voted for things getting cheaper. And not believing that politicians can just make shit up and getting away with it
I'd say that would be considered "most successful"
"Best" is very subjective