An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
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In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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The focusing muscles of the eyes move around 100,000 times a day. To give your leg muscles the same workout, you would need to walk 80km (50 miles) every day.
21
The average person in their lifetime will spend an estimated 20,160 minutes kissing!
212
Mars had an oxygen-rich atmosphere around 4 billion years ago
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