I don’t want to downplay genuine discovery, but your story about optically reading old records left me a little underwhelmed. The optical playing of records has been available in the commercial market for several years. Just do an Internet search for “laser turntables.”

Jerry Boehm
Schenectady, N.Y.

This is not an especially new invention. A commercial laser model capable of playing vinyl records (all sizes and speeds) in high fidelity has been available for at least the past 13 years.