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Charlie, now eight, started losing his sight aged four, and has only been able to see close up until now.
The US entrepreneur and Tesla-founder finds traffic "soul-destroying" - so he's come up with this.
Elon Musk talks about networks of tunnel roads, autonomous driving, space travel and his pet snail Gary.
The near-miss with a passenger jet is the first in the UK to involve more than one drone.
The Fori passenger ferry will now use electric power to make its river crossings.