It is known that early in his career he enrolled in a chemistry course at The Cooper Union for the Advancement of Science and Art to support his work on a new telegraphy system with Charles Batchelor.

Modern-day historians and medical professionals have suggested he may have had ADHD.

As he got older, Edison believed his hearing loss allowed him to avoid distraction and concentrate more easily on his work.

Much harder and more inspiring as he was a musician.

Heard Beethoven did that as well.

It is alleged that Edison would listen to a music player or piano by clamping his teeth into the wood to absorb the sound waves into his skull.

He was completely deaf in one ear and barely hearing in the other.

He subsequently concocted elaborate fictitious stories about the cause of his deafness.

The cause of his deafness has been attributed to a bout of scarlet fever during childhood and recurring untreated middle-ear infections.

Edison developed hearing problems at the age of 12.