maths and physics

A woman walks behind mirrors and lenses in the new permanent exhibition of the Mathematisch-Physikalischer Salon (Maths and Physics) at the Dresden Zwinger in Dresden, eastern Germany, Friday, April 12, 2013. One of the world s leading museums displaying historic scientific instruments and timepieces reopens after renovation of six years on April 14,2013.

Jens Meyer/AP

A woman walks behind mirrors and lenses in the new permanent exhibition of the Mathematisch-Physikalischer Salon (Maths and Physics) at the Dresden Zwinger in Dresden, eastern Germany, on Friday. After being closed for six years for renovation work, the oldest museum displaying historic scientific instruments and timepieces reopens on April 14 2013.