The March 27, 2018, photo shows the inside of a ...

Photo by Associated Press | published: March 27, 2018

The March 27, 2018, photo shows the inside of a rubber duck after it was cut open for the photo in Nauen, Germany. Swiss researchers say the cute, yellow bath-time friends harbor a dirty secret: Microbes are swimming inside. The Swiss Federal Institute of Aquatic Science and Technology says researchers turned up “dense growths of bacteria and fungi” on the insides of toys such as rubber ducks and crocodiles.