, 18 July 2018
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Octopuses have three hearts – one to pump blood around the body, and one each for its two gills.
Argon is the third most abundant gas in our atmosphere, making up almost 1%.
The International Space Station has a full crew of six people. However, there have been up to 13 people there at the same time.
The Great Artesian Basin is a giant underground ‘water tank’ covering about 22% of the Australian mainland.
The speed of sound is roughly 1235 kilometres per hour at sea level, depending on the temperature. It tends to be slower higher up due to cooler temperatures.
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