a: This is the relevant information: Credited to Lennon -- McCartney, it was written by John Lennon, with some collaboration from Paul McCartney.
John Lennon , with some collaboration from Paul McCartney
q: "A Hard Day's Night" is a song by the English rock band the Beatles. Credited to Lennon -- McCartney, it was written by John Lennon, with some collaboration from Paul McCartney. It was released on the film soundtrack of the same name in 1964. It was also released in the UK as a single, with "Things We Said Today" as its B-side.

Answer this question: who wrote the song a hard day's night?

a: To answer this question, we should know that: Some Unix as well as Linux distributions use symbolic links extensively in an effort to reorder the file system hierarchy.
to reorder the file system hierarchy
q: Some Unix as well as Linux distributions use symbolic links extensively in an effort to reorder the file system hierarchy. This is accomplished with several mechanisms, such as variant, context-dependent symbolic links. This offers the opportunity to create a more intuitive or application-specific directory tree and to reorganize the system without having to redesign the core set of system functions and utilities.

Based on this passage, what is the use of symbolic link in linux?

a: The relevant sentence in the passage is: Ken Curtis (July 2, 1916 -- April 28, 1991) was an American singer and actor best known for his role as Festus Haggen on the long-running CBS western television series Gunsmoke.
Ken Curtis
q: Context: Ken Curtis (July 2, 1916 -- April 28, 1991) was an American singer and actor best known for his role as Festus Haggen on the long-running CBS western television series Gunsmoke. Although he appeared on Gunsmoke in other earlier roles, he was first cast in his iconic role in season 8 episode 13, "Us Haggens". His next appearance was with his mule, Ruth, in "Prairie Wolfer" in season 9 episode 16, which also featured Noah Beery Jr., as a villain.

Question: who was the actor that played festus in gunsmoke?

a: The relevant information to answer the above question is: On 29 August 1949, the Soviet Union secretly conducted its first successful weapon test (First Lightning), based on the U.S. design at the Semipalatinsk in Kazakhstan.
On 29 August 1949
q:
On 29 August 1949, the Soviet Union secretly conducted its first successful weapon test (First Lightning), based on the U.S. design at the Semipalatinsk in Kazakhstan.

When did the soviets explode first atomic bomb?