Add Yahoo as a preferred source to see more of our stories on Google. A diner with red neon signs illuminated at night - Jon Bilous/Shutterstock With their mesmerizing glow, neon signs once dotted the ...

But these days, if lit-up letters in a shop window or on the wall of a nightclub catch your eye, odds are they’re made with light-emitting diodes, or LEDs, not the real thing. It’s a fate befalling ...