Today ushers in a week of palindrome dates, dates that can be read the same backwards and forwards in the system used in the U.S. It's 1-20-21, and a week later it'll be 1-29-21. It will be the first Inauguration Day in U.S. history that falls on a palindrome date. The next series of these dates will start December 1st. There are only two years where this can happen in a century, those ending in 11 and 21.