"It's not something subtle here, it's a major effect on the way the retina develops that requires light going through the body," said Prof Richard Lang, from Cincinnati Children's Hospital.
The best way to explore the country’s third-largest metropolis is on foot; a stroll through the diminutive city will take you past most of the historical sites, including the Old Town and Rhine River.
In particular, the oceans are also vital as sponges for green house gases, taking carbon dioxide out of the atmosphere through two processes - dissolving straight into the water column and also through photosynthesis by phytoplankton.
The admission shattered the faith of millions, and now readers who bought into Armstrong's inspiring fabrications - about his fightback from cancer to sporting triumph through honest hard work - are seeking compensation.
