justpassingby

Oh, can you give me one that was accidentally done wrong? I should really have posted this on the homework forums.

I'm a student and i remember my chemistry teacher telling me about and experiment that a scientist did wrong. Then other scientists tried to imitate it and got the right results but tried to change it to the scientist's result and were stumped about why they couldn't imitate the data. What was the name of that experiment again, anyone know?