If the Earth doubled in size, trees would immediately fall over. This is because surface gravity would be doubled. It would also mean dog-size and larger animals would not be able to run without breaking a leg.
Dogs tilt their heads when you speak to them to better pinpoint familiar words. Your dog is tilting its head when you speak to it to pinpoint where noises are coming from more quickly. This is done to listen out more accurately for familiar words such as 'walkies' and helps them to better understand the tone of your voice. If a dog doesn't tilt its head that often (as those with shorter muzzles might), it's because it relies less on sound and more on sight.
The Moon is shrinking. But only very slightly – by about 50m (164ft) in radius over the last several hundred million years. Mysterious seismic activity, known as moonquakes, could be to blame.
The longest anyone has held their breath underwater is over 24.5 minutes. The world record for breath-holding underwater was achieved by Croatian Budimir Šobat on 27 March 2021, who held his breath for a total of 24 minutes and 37 seconds. On average, a human can hold their breath between 30-90 seconds.
A lightning bolt is five times hotter than the surface of the Sun. The charge carried by a bolt of lightning is so intense that it has a temperature of 30,000°C (54,000°F).
You could sweat when you're anxious to alert others. One theory suggests we've evolved to sweat whilst anxious to alert the brains of other people around us so they are primed for whatever it is that's making us anxious. Brain scans have revealed that when you sniff the sweat of a panic-induced person, regions of the brain that handle emotional and social signals light up. When you're anxious your sympathetic nervous system releases hormones including adrenaline, which activates your sweat glands.
You remember more dreams when you sleep badly. Research suggests that if you sleep badly and wake up multiple times throughout the night you will be more likely to recall the content of any dreams you had. You are also more likely to remember a dream when woken from one.
The biggest butterfly in the world has a 31cm wingspan. It belongs to the Queen Alexandra's Birdwing butterfly, which you can find in the forests of the Oro Province, in the east of Papua New Guinea.
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