Spider fossil under UV light. (Olcott et al., Communications Earth and Environment, 2022) =================================================================== 21 APRIL 2022 A fossilized spider that glows under ultraviolet light has given away the secret of its exceptional 23-million-year-long existence. When researchers placed the fossil and others like it under a fluorescent microscope on a whim, they were surprised to notice the subtle outline of the arachnids suddenly pop against their background. "To our surprise they glowed, and so we got very interested in what the chemistry of these fossils was that made them glow," explains geologist Alison Olcott from the University of Kansas. Analyses...