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This podcast was originally published in 2014.

This is the Nature Pastcast each month raiding Nature's archive

and looking at key moments in science.

And in January 1896, the Invisible became visible.

Nature, January 23, 1896, page 274,

On a New Kind of Rays by W.C. Rentgen.

One of the fascinating things about X-rays was not only that they themselves were invisible

and they hadn't been perceived before,

but that they revealed things that couldn't be seen.

In kind of the popular telling of the discovery, he put his hand between the vacuum discharge tube

...