Short answers, pulled from the story.
"I Want to Hold Your Hand" was recorded on the 17th of October 1963 at EMI Studios in London. It was released in the United Kingdom on the 29th of November 1963, and in the United States on the 26th of December 1963.
Lennon and McCartney wrote "I Want to Hold Your Hand" in the basement music room at 57 Wimpole Street, London, where McCartney was lodging with the Asher family. Margaret Asher taught oboe in that room, and the pair sat at the piano there to compose the song.
"I Want to Hold Your Hand" sold more than 12 million copies worldwide, making it the Beatles' best-selling single. In the United States alone, it sold around five million copies.
Fourteen-year-old Marsha Albert introduced the song on WWDC radio in Washington, DC, after writing to disc jockey Carroll James and urging him to obtain a copy from Britain. Her on-air introduction read: "Ladies and gentlemen, for the first time on the air in the United States, here are the Beatles singing 'I Want to Hold Your Hand'."
The German-language version was titled "Komm, gib mir deine Hand", which translates literally as "Come, give me your hand". It was translated by Luxembourger musician Camillo Felgen under the pseudonym "Jean Nicolas" and recorded in Paris on the 29th of January 1964.
"I Want to Hold Your Hand" entered the Billboard Hot 100 on the 18th of January 1964 and reached number one on the 1st of February, where it stayed for seven weeks. It was the first of seven Lennon-McCartney songs to top the US charts in 1964, an all-time record for the most number-one songs written by one team in a single calendar year. Billboard named it the number-one song of 1964 and later ranked it the 48th biggest hit of all time on the Hot 100.