- The side of a hammer is called a cheek.
- The diameter of the sun is 1,390,000km (865,000 miles).
- The electric chair was invented by a dentist.
- Your feet typically produce a pint of sweat every single day.
- A rainbow can only be seen in the morning or late afternoon.
- No word in the English language rhymes with month.
- The wristwatch was invented in 1904.
- The Hindu-Arabic numeral system began developing as early as the 1st century with a full system being established around the 9th century, forming the basis of the numerical digits 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9 that we use today.
- Red blood cells are produced in bone marrow.
- The average lifespan of a squirrel is 9 years.
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