Purple streetlights cast a mysterious, eerie and fleeting glow across the nation
A purple wave of faulty streetlights has swept across the USA, generating incorrect theories, bad lighting and fans of an ...
Canada21d
Lamps and other products containing mercury
High intensity discharge (HID) lamps: they include metal halide and high-pressure sodium vapour lamps. They are similar in appearance ... Thermometers containing mercury are easily identified by the ...