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who was an american enlightenment thinker who investigated the nature of lightning invented the pennsylvania fireplace, and found the united states?
benjamin franklin.
john locke.
william penn.
sam adams.

An additional item of interest about Ben Franklin:

When Ben Franklin was a young man of 20, he set out on his goal of achieving perfecion.  In his words:  “I conceiv’d the bold and arduous project of arriving at moral perfection. I wish’d to live without committing any fault at any time.”   He created a list of thirteen virtues to which to devote himself, such as industriousness, sincerity and moderation.     Franklin kept with him a small recording book, with a chart for each of his virtue-oriented goals.  He would evaluate himself each day and mark any time he violated one of the virtues.  His goal was to get the number of bad marks in his book down to zero and thus be living a "clean" life.  He never got through a day completely "clean," without violating one or another virtue in some way.   But he said of the project: “Tho’ I never arrived at the perfection I had been so ambitious of obtaining, … yet I was, by the endeavour, a better and a happier man than I otherwise should have been.”

early human migrations are the earliest migrations and expansions of archaic and modern humans across continents and are believed to have begun approximately 2 million years ago with the out of africa migration of homo erectus. this initial migration was followed by other archaic humans including h. heidelbergensis, which lived around 500,000 years ago and was the likely ancestor of both denisovans and neanderthals. early hominids were said to have "crossed land bridges that were eventually covered in water" .

within africa, homo sapiens dispersed around the time of its speciation, roughly 300,000 years ago.the "recent african origin" paradigm suggests that the anatomically modern humans outside of africa descend from a population of homo sapiens migrating from east africa roughly 70,000 years ago and spreading along the southern coast of asia and to oceania before 50,000 years ago. modern humans spread across europe about 40,000 years ago.

the migrating modern human populations are known to have interbred with local varieties of archaic humans, so that contemporary human populations are descended in small part (below 10% contribution) from regional varieties of archaic humans.

after the last glacial maximum, north eurasian populations migrated to the americas about 20,000 years ago. northern eurasia was peopled after 12,000 years ago, in the beginning holocene. arctic canada and greenland were reached by the paleo-eskimo expansion around 4,000 years ago. finally, polynesia was peopled after 2,000 years ago, by the austronesian expansion.