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Sharks have an extraordinary sense of smell, but the "mile away" claim is a myth. They can detect blood at concentrations of about 1 part per million — roughly one drop in a small swimming pool — not from miles away.

This is one of the most persistent myths in popular science. Brain imaging studies show that virtually all brain regions are active at some point, and most of the brain is active almost all of the time.

The Great Pyramid was completed around 2560 BC. Cleopatra was born in 69 BC — about 2,500 years after the pyramid. The Moon landing was in 1969 AD — only about 2,038 years after Cleopatra. So yes, she's closer in time to Neil Armstrong than to the pyramids.

Goldfish can actually remember things for months. Studies have trained goldfish to press levers for food at specific times of day — far beyond a 3-second window. The myth likely spread because it's a convenient excuse.

Lightning absolutely strikes the same place twice — and often many more times. The Empire State Building is struck by lightning about 20–25 times per year. Tall, pointed objects are natural lightning rods.

Walt Disney died on December 15, 1966, and was cremated — not frozen. The cryonics rumour has no factual basis. The first known human cryonic preservation didn't even occur until January 1967, after Disney's death.

Chinese astronaut Yang Liwei confirmed after his 2003 spaceflight that he could not see the wall. It's too narrow (typically 4–5 metres wide) to be visible from low Earth orbit without optical aids.

Honey's low moisture content and acidic pH make it naturally antimicrobial. Archaeologists have found honey in Egyptian tombs dating back over 3,000 years that was still perfectly preserved and tasted fine.

Teaching at Oxford began around 1096–1167 AD. The Aztec Empire was founded in 1428 AD. Oxford is roughly 300 years older than the Aztec civilisation.

Venus rotates so slowly that one full rotation (its day) takes about 243 Earth days. But Venus orbits the Sun in only 225 Earth days — making its year shorter than its day.

Einstein excelled at mathematics and physics from childhood. The myth comes from a misinterpretation of Swiss grading systems. He failed his first entrance exam to ETH Zürich — but that was because he was two years younger than typical applicants, not because he was bad at maths.

Gentoo and Adélie penguins are famous for presenting their chosen mate with a carefully selected pebble. If accepted, the pebble is used to build their nest together. Males sometimes steal pebbles from rivals to impress a partner.

Napoleon stood about 5 ft 7 in (170 cm) — average height for a French man of his time. The "short Napoleon" myth partly stems from British propaganda and a mix-up between French and English inch measurements.

Diamond scores 10 on the Mohs hardness scale — the maximum. It can only be scratched by another diamond. This extreme hardness comes from its crystal structure, where each carbon atom is bonded to four others in a tetrahedral arrangement.