what does "blood is thinner and cooler "mean?
[The Rice's fifth floor, the President's, was reserved for those closest to him: Larry, Ken, Dave, Evelyn, Dr. Burkley, Generals Clifton and Mc-Hugh. The Secret Service arsenal was in 528, the Houston White House switchboard in 514-516. Directly overhead, the Vice President was eating in his sixth-floor Gold Suite ($100 a day) with Lady Bird. His smaller staff was clustered around him. Immediately across the hall, in 625, Liz Carpenter was changing her clothes and reflecting with some despair that she hadn't had much luck making friends among the President's staff. They didn't exactly cut her. They just maintained their distance. Maybe blood is thinner and cooler in Massachusetts, she thought, straightening seams. Liz was at the mirror, inspecting herself, when the Gold Suite door swung open on the other side of the passage and its occupant hurried toward the stairs. Lyndon B. Johnson had an appointment with John F. Kennedy.]
1. what does "The Secret Service arsenal" mean? does it equal to "agent"?
2.what does "blood is thinner and cooler "mean?