- Months that start on a Sunday will always have a Friday the 13th.
- Rhinoceros have 3 toes on each foot.
- The world's most expensive spice is saffron.
- A cat can keep purring while inhaling and exhaling.
- Turnips turn green when sunburnt.
- Tennis was originally played with bare hands.
- Adults laugh only about 15 to 100 times a day, while preschoolers laugh an average of 300 times a day.
- Porcupines float in water.
- A camel can shut its nostrils during a desert sandstorm.
- Swiss mathematician Leonhard Euler was probably the most influential mathematician of the 18th century, making discoveries in graph theory and introducing many modern mathematical words and notations among other things.
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