This week we look at the theory and chemistry of photography.

A Japanese gourmand discovers the fifth element of taste.

Some surprisingly controversial theories of human longevity. 

New forensics techniques are allowing researchers to solve historical mysteries based on the small traces we leave on everyday objects.

A lesson in humility begets a scientific revolution.

An engraving in the Science History Institute’s collections hints at the ways art and science were intertwined in the Age of Enlightenment.