In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.

[Q]: A muzzle brake or recoil compensator is a device connected to the muzzle of a firearm or cannon that redirects propellant gases to counter recoil and unwanted rising of the barrel. The concept was first introduced for artillery and was a common feature on many anti-tank guns, especially those mounted on tanks, in order to reduce the area needed to take up the strokes of recoil and kickback. They have been used in various forms for rifles and pistols to help control recoil and the rising of the barrel that normally occurs after firing. They are used on pistols for practical pistol competitions, and are usually called compensators in this context.
[A]: what does a compensator do for a gun


[Q]: The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom, discovered in 1911 by Ernest Rutherford based on the 1909 Geiger -- Marsden gold foil experiment. After the discovery of the neutron in 1932, models for a nucleus composed of protons and neutrons were quickly developed by Dmitri Ivanenko and Werner Heisenberg. Almost all of the mass of an atom is located in the nucleus, with a very small contribution from the electron cloud. Protons and neutrons are bound together to form a nucleus by the nuclear force.
[A]: who said most of an atoms mass is in the nucleus


[Q]: The Philadelphia Eagles are a professional American football franchise based in Philadelphia, Pennsylvania. The Eagles compete in the National Football League (NFL) as a member club of the league's National Football Conference (NFC) East division. They are Super Bowl champions, having won Super Bowl LII; their first Super Bowl in franchise history, and their fourth NFL title overall, after winning the Championship Game in 1948, 1949, and 1960.
[A]:
when did the eagles last win the super bowl