The conversation between human and AI assistant.
Why don't all months have same number of days?
Sure, that would be great.
Well, the Gregorian calendar, which is the calendar used by most of the world, was created to align with the Earth's orbit around the Sun. But the ancient Romans, who first established a calendar, believed that even numbers were unlucky, so they divided the year into 10 months with alternating months having 29 or 31 days. Later on, two more months were added, which is why we have the calendar we use today.