781Which country’s national airline operated the first scheduled commercial passenger jet service, using the de Havilland Comet in 1952?
782Which was the first synthetic antibacterial drug to be widely used in medicine, introduced in the 1930s?
783Which ancient wonder was the tallest man-made structure in the world for thousands of years?
784Which country’s expedition was the first to reach the summit of Annapurna, the first 8,000-metre peak ever climbed, in 1950?
785Who was the first person to fly an aircraft faster than the speed of sound while diving, though not in sustained level flight, in the 1940s test programs?
786Which was the first artificial satellite to carry a living passenger back to Earth safely, in 1960?
787Which was the first postage stamp ever issued, introduced in Britain in 1840?
788Which country issued the world’s first adhesive postage stamp?
789Which was the first practical typewriter keyboard layout, still widely used today, commonly known by its first six letters?
790Which country built the first operational jet-powered fighter aircraft used in combat, during the Second World War?
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