An incandescent light bulb, incandescent lamp, or incandescent light globe is a type of electric light that uses a wire filament that is heated until it lights. To protect the filament from oxidation, it is encased in a glass bulb with a vacuum or inert gas. The filament was the source of the difficulty with Swan's design, Edison understood. A thin filament with a high electrical resistance would make a lamp feasible since it would only take a little amount of electricity to light up. In December 1879, he displayed his lightbulb.

Emmanuel Jean-Michel Frédéric Macron born December 21, 1977 he is a French politician who has been the country's president since May 14, 2017. Macron was born in Amiens and studied philosophy at Paris Nanterre University before going on to Sciences Po to get a master's degree in public affairs and graduating from the École nationale d'administration in 2004. He began his career as a senior civil servant at the Inspectorate General of Finances before joining Rothschild & Co. as an investment banker.

On December 21, 2012, South Korean musician Psy's "Gangnam Style" became the first music video to exceed 1 billion views on YouTube. When it surpassed the then-maximum of 2.14 billion views, it "broke" YouTube's play counter. For over five years, the mega-hit, which highlights the lifestyle associated with Seoul's opulent Gangnam District, ruled supreme on YouTube. In July 2017, Wiz Khalifa's video for "See You Again," featuring Charlie Puth, dethroned it.

In 1851, the Solani Aqueduct Railway was built in Roorkee. It was hauled by the Thomason steam locomotive, named after a British officer-in-charge of that name. The railway transported construction materials for an aqueduct over the Solani River. In 1852, the Madras Guaranteed Railway Company was incorporated.

Marie and Pierre Curie successfully extract radioactive radium salts from the mineral pitchblende in their Paris laboratory on December 20, 1902. In their pitchblende study in 1898, the Curies discovered the elements radium and polonium. 

Three NASA astronauts set off on a voyage that would take them "Round the Moon and Back" 50 years ago. The performance of the command and service modules was shown during the Apollo 8 mission. This historic mission launched on December 21, 1968, to test a lunar trajectory and was the Saturn V rocket's first manned launch. Apollo 8 was launched from Cape Canaveral, Florida, by a three-stage Saturn 5 rocket, with astronauts Frank Borman, James Lovell, Jr., and William Anders onboard. The crew became the first human spacecraft to reach orbit around the moon on Christmas Eve.

On December 21, 1762, at St Margaret's Church in Barking. Elizabeth was the daughter of the innkeeper of The Bell at Wapping, and James Cook resided further upriver at Shadwell. Cook was fourteen years older than Elizabeth, who was only twenty years old. Because neither of them belonged to the parish of Barking, they were married by George Downing, vicar of Little Wakering in Essex, with the authority of the Archbishop of Canterbury.

Ashley Cole, an English football coach and former player who was born on December 20, 1980, is presently the first-team coach at Premier League team Everton. He was a left-back when he played, most notably for Arsenal and Chelsea. Cole is regarded as one of the best defenders of his generation by many analysts and other professional athletes. For the majority of his career, some have even said that he is the best left-back in the world.

According to rumours, Elton John will marry his companion of more than 20 years this weekend in England. Several news outlets reported that the 67-year-old singer and Canadian-born director David Furnish will marry on Sunday at their home in Windsor, Berkshire, near London. Furnish and John married on December 21, 2005, the first day civil partnerships may be performed in England, in the town of Windsor, Berkshire.

The couple married in 1989 on Branson's Necker Island, a 74-acre island in the Caribbean Sea off the coast of the British Virgin Islands. In 2016, the pair celebrated their 40th wedding anniversary, and the Virgin chief paid homage to Joan with a love letter. While Richard Branson is one of the most successful businesspeople of all time, his personal life isn't half bad either. Richard and Joan Templeman have been married for almost 40 years and appear to be stronger than ever.

Fitzgerald, Francis Scott Key, is a well-known author of short tales and novels. He is largely recognised as one of the best writers to emerge from American soil in the twentieth century. Fitzgerald died of a severe heart attack on December 21, 1940. Since his debut publication, his work has influenced authors. T.S. Eliot, one of the twentieth century's most prominent and beloved poets, said in a letter to Fitzgerald following the publication of The Great Gatsby.

Ed Hillary and June Mulgrew tour Nepal's Solu Khumbu in 1984. In the late 1980s, Hillary and Mulgrew resided throughout India when Hillary was the New Zealand ambassador, and they travelled widely in the area. Hillary retired in 1989, the year they married. Hillary's official companion during his tenure as New Zealand's High Commissioner to India and Nepal, which he concluded in July, was June Mulgrew.

Samuel L. Jackson is a legendary Hollywood actor who has acted in over 100 films over his career. Jackson, who was abandoned by his father as a youngster, overcame a rough life to become one of Hollywood's most successful actors. Despite his stuttering, he went on to pursue a profession in acting with persistence and hard effort. Samuel Leroy Jackson was born in Washington, D.C. on December 21, 1948. He was reared by his mother, Elizabeth Jackson, in Chattanooga, Tennessee, since his father lived away from the family and subsequently died of alcoholism. He only met his father twice throughout his life.

The authentic men in whom nature has succeeded are the great ones. They are not extraordinary – they are in the proper sequence, as they should be. Autar Singh Paintal, who died on December 21, 2004 in Delhi, was a brilliant man who will be remembered not just for his contributions to physiology but also for his deeds of kindness.

According to Maples, the 1993 Long Island Rail Road shooting on December 7, 1993, prompted Trump to rethink his life and propose to her. On December 20, 1993, the pair married at New York City's Plaza Hotel in a ceremony attended by 1,000 people, including Rosie O'Donnell and O. J. Simpson. There was a lot of champagne and caviar at the reception. Maples wore a Carolina Herrera white satin gown and a borrowed $2 million Harry Winston tiara, but the ceremony was brief and transactional.