Just heard the story on the news of how he dispelled the possibility of time travel.
He had a time-capsule buried that said he was holding a party that evening and if a time traveller found this, they were to come to the party.
No uninvited guests turned up thus dispelling the possibility of...
Can you imagine him now, up there, talking with Galileo, Newton & Einstein - he's in another world.
Totally awesome and inspirational human being, showing what can still be achieved despite the [massive] challenges of physical disability.
RIP Great Man ....