Banking. All banks require a valid Social Security number prior to opening any form of account, including checking, savings, certificates of deposit, credit cards, vehicle loans and mortgages. They use this for exclusive identification purposes, as no two people have the same number.
The first official Christmas tree in the city of Chicago was installed in 1913 in Grant Park and lit on Christmas Eve by then-mayor Carter Harrison. This first tree was a 35-foot (11 m) tall spruce tree.
According to the story on NPR, Barnard decided to compile a list of the trees in Central Park while writing his book, New York City Trees, available to preview here on Google Books. Chaya agreed to help with the lengthy task, and the two discovered that there are around 2o different species in the park.