sir isaac newton displayed increasingly bizarre behavior in his later life. by examining strands of his hair, it was determined that it contained mercury, likely the result of newton's alchemical experiments. mercury absorbed into the body can cause mental illness.

to test his theory of optics, sir isaac newton slid a sewing needle under his eyeball, pushed it all the way to the back of his eye, and wiggled it around.

sir isaac newton was never hit in the head by an apple. that story was made up by john conduitt 60 years after newton published his theory of gravity.

sir isaac newton had terrible social skills, never married, and died a virgin.