How can someone's clothing show that they have fired a gun?

We can tell someone’s clothing show that they have fired a gun when the burning gunpowder residue stays or remains on the clothes. If the clothes test positive for GSR gunshot residue it means that it is very close to a gun that was fired. Remember that a traces of a gunpowder residue remains on clothing or skin and on the surface after discharging a firearm is 78 hours.  

the following best describes postwar era writers in their works:

many writers,authors,novelists,poets concentrated more on social art and social writing and stayed away from political writings.

answer: in october 1962, an american u-2 spy plane secretly photographed nuclear missile sites being built by the soviet union on the island of cuba. president kennedy did not want the soviet union and cuba to know that he had discovered the missiles. he met in secret with his advisors for several days to discuss the problem.

explanation: