> Researchers tested two authenticated locks of Beethoven’s hair. One had 380 micrograms of lead per gram of hair, while the other had 258 micrograms. For refer

> Researchers tested two authenticated locks of Beethoven’s hair. One had 380 micrograms of lead per gram of hair, while the other had 258 micrograms. For reference, a normal level of lead in a gram of hair is around 4 micrograms or less. His hair also had 13 times the normal level of arsenic, and four times the normal level of mercury.