Scientist Quotes and aphorisms about human nature Gad Saad Youssef Ziedan Anthony Fauci Margaret Mead Miguel Nicolelis ,, I think the word 'soul' - it depends on what you define by 'soul.' If you're defining it as a mysti... Miguel Nicolelis Elie Metchnikoff Elie Metchnikoff Steven Pinker Steven Pinker