Calendar
Think about how important the calendar is to you. Knowing dates like birthdays and special events is so important, and the calendar helps us to keep track of the year, knowing what to expect from the weather, making plans for the future, and so much more. We owe a lot of this to Mesopotamia.
Source: Shutterstock.com
One of the first-ever calendars was created in Mesopotamia over 6,000 years ago. It featured months divided up into four weeks of seven days, very similar to what we use nowadays.