- The primary reason for growing rice in flooded paddies is to drown the weeds surrounding the young seedlings (rice can grow in well drained areas).
- Koalas sleep around 18 hours a day.
- Only female mosquitoes bite.
- Banana plants are the largest plants without a woody stem (they belong to the same family as lilies, orchids and palms).
- 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.
- The most common disease is tooth decay.
- An octopus pupil is rectangular.
- Humans are the only primates that don't have pigment in the palms of their hands.
- The US flag has 13 stripes (representing the original 13 states).
- The winter of 1932 was so cold that Niagara Falls froze over completely.
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