- House cats have 18 claws.
- A King Cobra is the biggest of all poisonous snakes and can grow to over 4 metres (13 feet) long.
- Sea water is approximately 3.5% salt.
- The average porcupine has 30,000 spikes.
- The symbols used for addition (+) and subtraction (-) have been around for thousands of years but it wasn't until the 16th century that most mathematical symbols were invented. Before this time math equations were written in words, making it very time consuming..
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