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Like fingerprints, everyone’s tongue print is unique.

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.

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The largest continent in the world is Asia.

90 percent of the world’s population lives in the Northern Hemisphere.

You can smell ants. Many species of ants release strong-smelling chemicals when they’re angry, threatened or being squished. Trap-jaw ants release a chocolatey smell when annoyed, while citronella ants earn their name from the lemony odour they give off.

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All the world’s bacteria stacked on top of each other would stretch for 10 billion light-years. Together, Earth's 0.001mm-long microbes could wrap around the Milky Way over 20,000 times.