Today, photography is commonly accepted as a fine art. But through much of the 19th century, it was an art world outcast.

Theories from psychology, education, philosophy, and sociology, show how complex and subconscious the feeling of empathy can be.

When tragedies strike, it is through photographs, rather than think pieces and reportage that the reader can see the sheer scale of the problem.

The 175th anniversary of William Henry Fox Talbot's calotype photography.