The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
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Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
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There are so many kinds of apples that if you ate a new one everyday, it would take over 20 years to try them all.
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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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The oldest glowing lightbulb was first switched on in 1901 and lives in fire stations in Livermore, CA. It is known as the Centennial Light.
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If Earth's history was condensed into twenty-four hours, life would've appeared at around 4am, land plants at 10:24pm, dinosaur extinction at 11:41pm, and human history would’ve began at 11:58:43pm.
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