The word "scientist" still conjures up an image of an Albert Einstein lookalike — an unkempt figure (usually male and elderly) — or else a youthful geek. There's now of course far more racial and gender diversity among scientists, though still not enough.
But even in earlier centuries, scientists weren't all in the same mould. Consider, for instance two of the greatest: Newton and Darwin. Newton's mental powers were really "off the scale": when asked how he cracked such deep problems, he said "by thinking on them continually." He was solitary and reclusive when young; vain and vindictive in his later years. Darwin, by contrast, was an agreeable and sympathetic personality, and modest in his self-assessment. "I have a fair share of invention," he wrote in his autobiography," and of common sense or judgment, such as every fairly successful lawyer or doctor must have, but not, I believe, in any higher degree."
