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Days are named after celestial bodies and Norse gods: Sunday (Sun), Monday (Moon), Tuesday (Tiw), Wednesday (Odin)

Studies show Tuesday is the most productive workday, while Friday afternoon is the least productive

More babies are born on Tuesdays than any other day, while weekends have the fewest births due to fewer scheduled deliveries

Heart attacks are 20% more likely on Mondays, a phenomenon called 'Monday cardiac phenomenon'

Saturday is the busiest shopping day worldwide, while Tuesday typically has the lowest retail foot traffic

Tuesdays and Wednesdays often have the cheapest flights, while Sundays are typically most expensive

Monday is the first day of the week in most of Europe and Asia, while Sunday starts the week in the US and Canada

Any month starting on Sunday will have a Friday the 13th. There's at least one Friday the 13th every year