What is an autograph worth?
An autograph is a famous person's signature, but what determines how valuable it is? Marshall Brain discusses the relative value of autographs -- and what you can do to increase the value of your own signature.
También te puede gustar
Discovery
BBC World Service
Real Ghost Stories Online
Real Ghost Stories Online | Paranormal, Supernatural & Horror Radio
Vida Eterna. Respuestas desde la Ciencia | Dr. Manuel Sans Segarra
Dr. Manuel Sans Segarra
The Dissenter
Ricardo Lopes
La Science, CQFD
France Culture
Breaking Down: Collapse
Kory & Kellan
The 365 Days of Astronomy
365DaysOfAstronomy.org
Hematologic Oncology Update
Dr. Neil Love
Cryptids and Cold Ones
John, Evan, Kyle
Oncology Today with Dr Neil Love
Dr. Neil Love
Discovery
BBC World Service
Real Ghost Stories Online
Real Ghost Stories Online | Paranormal, Supernatural & Horror Radio
Vida Eterna. Respuestas desde la Ciencia | Dr. Manuel Sans Segarra
Dr. Manuel Sans Segarra
The Dissenter
Ricardo Lopes
La Science, CQFD
France Culture
Breaking Down: Collapse
Kory & Kellan
The 365 Days of Astronomy
365DaysOfAstronomy.org
Hematologic Oncology Update
Dr. Neil Love
Cryptids and Cold Ones
John, Evan, Kyle
Oncology Today with Dr Neil Love
Dr. Neil Love
Debate de la comunidad