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From Da Vinci's notebook there's evidence that he had drawn up blueprints for all manner of objects and inventions such as the helicoptor, automobile, and parachute. So why didn't he finish what he started and invent them? Did he not have the materials? Were they just wishful thinking of the...

I've tried to click on the View all posts by...[user] and View posts started by [user] in their profile but this option, it seems, has been disabled. Is there actually a restriction on this or is this a glitch that has come about since the upgrade to vB3?