Every Two Hours, This 16-Year-Old Needs to Be Told What Day It Is

The More You Know

• The idea that a man should spend two months salary on an engagement ring was popularized by De Beers' ad agency.
• The smallest unit of measurement in the universe is the Planck length.
• Surfaces near the equator move much faster than those in other locations on Earth.
• The Eiffel Tower was inaugurated the same year Nintendo was founded.