#OTD in 1895, Wilhelm Röntgen noticed that when he shielded his tube with heavy black cardboard, a screen nine feet away still glowed. He called the unknown rays "X-rays."
Read more from @NobelPrize: go.aps.org/3UI7TPU
#PhysicsHistory
Read more from @NobelPrize: go.aps.org/3UI7TPU
#PhysicsHistory