2020 is here, and many people are excited about starting a new decade. Yet for those who watch Social Security's financial condition, New Year's Day just means we're a year closer to the challenges facing the key government program.This year is likely to be the last one that Social Security manages to keep its spending under a key psychological level. Starting in 2021, the amount of money that the Social Security Administration spends on benefits for retirees and survivors of retired workers will exceed $1 trillion for the first time -- and that's just the beginning of an upward surge...