The sensor allows the pilot light to be automatically re-ignited if the flame is no longer present. The circuit is a surprisingly simple one, with a PNP transistor being turned on by the flame ...

A demonstration of how a source of light is required to see objects in the dark. The presenter shines a torch around a dark room and sees shiny and white objects. The presenter also shows Boffin ...

Thousands gather at Phu Day Relic Site on the evening of April 2 to take part in the torch procession. Photo: Trong Tung Devotees light the sacred flame from the temple altar. Photo: Trong Tung More ...