Year 1939 (MCMXXXIX) was a common year starting on Sunday (link will display the full calendar) of the Gregorian calendar. This year also marks the start of the Second World War, the deadliest human conflict in history.

Below, events of World War II have the WWII prefix.

Jesse Woodson James (September 5, 1847 – April 3, 1882) was an American outlaw, gang leader, bank robber, train robber and murderer from the state of Missouri and the most famous member of the James-Younger Gang. Already a celebrity when he was alive, he became a legendary figure of the Wild West after his death. Some recent scholars place him in the context of regional insurgencies of ex-Confederates following the American Civil War rather than a manifestation of frontier lawlessness or alleged economic justice.

Jesse and his brother Frank James were Confederate guerrillas during the Civil War. They were accused of participating in atrocities committed against Union soldiers. After the war, as members of one gang or another, they robbed banks, stagecoaches and trains. Despite popular portrayals of James as a kind of Robin Hood, robbing from the rich and giving to the poor, there is no evidence that he and his gang used their robbery gains for anyone but themselves.

The James brothers were most active with their gang from about 1866 until 1876, when their attempted robbery of a bank in Northfield, Minnesota, resulted in the capture or deaths of several members. They continued in crime for several years, recruiting new members, but were under increasing pressure from law enforcement. On April 3, 1882, Jesse James was killed by Robert Ford, who was a member of the gang living in the James house and who was hoping to collect a state reward on James' head.

Alexander Graham Bell (March 3, 1847 – August 2, 1922) was an eminent scientist, inventor, engineer and innovator who is credited with inventing the first practical telephone.

Bell's father, grandfather, and brother had all been associated with work on elocution and speech, and both his mother and wife were deaf, profoundly influencing Bell's life's work. His research on hearing and speech further led him to experiment with hearing devices which eventually culminated in Bell being awarded the first US patent for the telephone in 1876. In retrospect, Bell considered his most famous invention an intrusion on his real work as a scientist and refused to have a telephone in his study.

Many other inventions marked Bell's later life, including groundbreaking work in optical telecommunications, hydrofoils and aeronautics. In 1888, Bell became one of the founding members of the National Geographic Society. He has been described as one of the most influential figures in human history.

Alexander Bell was born in Edinburgh, Scotland on March 3, 1847. The family home was at 16 South Charlotte Street, and has a stone inscription, marking it as Alexander Graham Bell's birthplace. He had two brothers: Melville James Bell (1845–70) and Edward Charles Bell (1848–67). Both of his brothers died of tuberculosis. His father was Professor Alexander Melville Bell, and his mother was Eliza Grace (née Symonds). Although he was born "Alexander", at age 10, he made a plea to his father to have a middle name like his two brothers. For his 11th birthday, his father acquiesced and allowed him to adopt the middle name "Graham", chosen out of admiration for Alexander Graham, a Canadian being treated by his father and boarder who had become a family friend. To close relatives and friends he remained "Aleck" which his father continued to call him into later life.

James Maitland "Jimmy" Stewart (May 20, 1908 – July 2, 1997) was an American film and stage actor, known for his distinctive voice and persona. Over the course of his career, he starred in many films widely considered classics and was nominated for five Academy Awards, winning one in competition and receiving one Lifetime Achievement award. He was a major MGM contract star. He also had a noted military career and was a World War II and Vietnam War veteran, who rose to the rank of Brigadier General in the United States Air Force Reserve.

James Maitland Stewart was born on May 20, 1908, in Indiana, Pennsylvania, the son of Elizabeth Ruth (née Jackson) and Alexander Maitland Stewart, who owned a hardware store. Stewart's parents were of Scottish descent and Presbyterians. His maternal ancestors served in the American Revolution, the War of 1812 and the American Civil War. The eldest of three children (he had two younger sisters, Virginia and Mary), he was expected to continue his father's business, which had been in the family for three generations. His mother was an excellent pianist but his father discouraged Stewart's request for lessons. But when his father accepted a gift of an accordion from a guest, young Stewart quickly learned to play the instrument, which became a fixture off-stage during his acting career. As the family grew, music continued to be an important part of family life.

Sherlock Holmes ( /ˈʃɜrlɒk ˈhoʊmz/) is a fictional detective created by Scottish author and physician Sir Arthur Conan Doyle. The fantastic London-based "consulting detective", Holmes is famous for his astute logical reasoning, his ability to adopt almost any disguise, and his use of forensic science skills to solve difficult cases.

Holmes, who first appeared in publication in 1887, was featured in four novels and 56 short stories. The first novel, A Study in Scarlet, appeared in Beeton's Christmas Annual in 1887 and the second, The Sign of the Four, in Lippincott's Monthly Magazine in 1890. The character grew tremendously in popularity with the first series of short stories in Strand Magazine, beginning with A Scandal in Bohemia in 1891; further series of short stories and two novels published in serial form appeared between then and 1927. The stories cover a period from around 1880 up to 1914.

All but four stories are narrated by Holmes's friend and biographer, Dr. John H. Watson; two are narrated by Holmes himself ("The Blanched Soldier" and "The Lion's Mane") and two others are written in the third person ("The Mazarin Stone" and "His Last Bow"). In two stories ("The Musgrave Ritual" and "The Gloria Scott"), Holmes tells Watson the main story from his memories, while Watson becomes the narrator of the frame story. The first and fourth novels, A Study in Scarlet and The Valley of Fear, each include a long interval of omniscient narration recounting events unknown to either Holmes or Watson.