Watch the scientific mysteries of the universe come to life this year as you read some of the best quotes of the franchise in this 2021 The Big Bang Theory mini calendar. Sheldon, Leonard, Penny and their friends will keep you on your toes as you navigate your galactic schedule with ease. Mini calendars are ideal for those with limited wall space. These Forest Stewardship Council-certified calendars highlight 13 images in a compact size. Sixteen months (Sep. 2020-Dec. 2021).