What made Jenner so clever?
He was different because he was a ‘lateral thinker’. He did not believe everything he was told, but wanted the proof for it. If he could not get that, he thought of better explanations and did the experiments to test them. He was also interested in lots of different things. And sometimes great discoveries come when you bring together knowledge in different sciences. He persisted with ideas that he believed in, even when opposed by ‘the establishment’.