When written in Roman numerals, the year 1666 is the only date in history that is written from the highest to the lowest value, MDCLXVI (1000 + 500 + 100 + 50 + 10 + 5 + 1).
Up to the age of six or seven months, a child can breathe and swallow at the same time. An adult cannot do this.
The average 60-minute audio cassette tape has 562.5 feet of tape in it.
At a jet plane's speed of 1,000 km (620 miles) per hour, the length of the plane becomes one atom shorter than its original length.
