Burning glass extremely high temperatures without the need for fuel or large supplies of electricity. They sometimes employ a large parabolic array of mirrors (some facilities are several stories high) to focus light to a high intensity. The Olympic torch that is carried around the host country of the Olympic Games is lit by a burning glass, at the site of ancient Olympia in Greece. Burning glass A burning glass or burning lens is a large convex lens that can concentrate the sun's rays onto a small area, heating up the area and thus resulting in ignition of the exposed surface. Burning
Ancient Olympic pentathlon Ancient Olympic pentathlon The Ancient Olympic pentathlon () was an athletic contest at the Ancient Olympic Games, and other Panhellenic Games of Ancient Greece. The name derives from Greek, combining the words "pente" (five) and "athlon" (competition). Five events were contested over one day, starting with the "stadion" (a short foot race) followed by the Javelin throw, Discus throw, Long jump (the order of these three events is still unclear), and ending with wrestling. While Pentathletes were considered to be inferior to the specialized athletes in a certain event, they were superior in overall development and were some of the