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.
It was more than a decade before televisions were made and sold commercially. In 1939, RCA began producing a commercially viable product and this represented the first widely available television. In the UK, broadcasting began in 1929 using John Logie Baird's electro-mechanical system first demonstrated in 1925.