Find an Orthopedic Specialist Near You. However, behind knee pain may be a symptom of deep vein thrombosis (blood clot in the leg), which is a serious and life-threatening condition. The blood clot can break loose and cause a pulmonary embolism in the lung, a heart attack, or even stroke. Deep vein thrombosis has similar symptoms to a Bakerâs cyst.
Baird was a Scottish engineer and inventor of the world's first working television system in Hastings, England, in 1923. His public demonstration subsequently took place in Selfridges, a department store in London England, during March 1925.
Television has been around since 1925. It was then that John Logie Baird demonstrated the first television system to the public. His system was an electro-mechanical device thâ¦at used a spinning disc to create a moving image. It was used for the very first public broadcasts in 1929 by the BBC in London.