David Attenborough

The man's spent SEVENTY YEARS educating people about the world in which they live. He's been a relentless campaigner for environmental reform for literally decades. He has almost certainly done more to bring global empathy to the British than anyone else, and yet he's still remarkably humble.

Today is his 100th birthday, and he's still doing the thing he's been doing almost since he joined the BBC back in 1952. He's never sold out, never changed his tune, never aligned himself in any way that won't go some way towards helping to educate people.

And that's exceptionally rare.