در چهار منبع راجع بهش گفته شده. که وقتی در کمبریج طاعون اومده بود، و نیوتن به خونه مادرش رفته بود -- چرا که دانشگاه تعطیل بود-- او دید که یه سیب از درخت پایین می افته، رو کلش یا یه جای دیگه. 
Four sources told it. That when they had the plague in Cambridge, and he went down to his mother's farm -- because the university was closed -- he saw an apple fall from a tree, or on his head or something. 