When did the following event happen?
The cardboard box is invented as a means of low-cost and recyclable packaging.
Select a space in the timeline below.
1582
Pope Gregory XIII issues the Gregorian Calendar, reducing the number of leap years to make the average year 365.2425 days long.
Note:
BCE means that the date is the number of years before the current era (CE/AD).
c. is short for 'circa' and indicates that the date is considered approximate.