Tardigrades — barely half a millimetre of eight-legged, water-dwelling life — can dry out almost completely, endure radiation, and even ride out the vacuum of space, then plump back up and walk away once water returns.

Olympus Mons rises about 22 kilometres above the Martian plains — roughly two and a half times Everest's height above sea level. It spreads so wide that, standing on its flank, you'd see the summit curve away beneath the horizon.

The axolotl stays in its larval form for life, keeping its feathery external gills instead of morphing into a land animal. It can also regrow lost limbs, parts of its heart, and even sections of its brain, which is why labs adore it.

Launched in 1977, Voyager 1 has slipped past the Sun's bubble of influence into interstellar space and is now the most distant object humans have ever built. Its faint signal still reaches Earth, though it takes most of a day to arrive.

An octopus keeps most of its neurons out in its arms, so each limb can taste, touch, and decide almost on its own. Add three hearts, copper-based blue blood, and a boneless body that pours through a coin-sized gap, and you get one of the ocean's sharpest minds.

Saturn is so light for its size — under an eighth of Earth's density — that, given a bathtub big enough, it would bob on the water. Its famous rings are mostly countless chunks of ice, some like dust, others the size of houses.

Honey bees build their combs from wax they secrete, shaping it into hexagons — the pattern that holds the most honey for the least wall. A forager back from a good find waggles out a coded dance that points hivemates toward the flowers.

An aurora flares when particles streaming off the Sun crash into oxygen and nitrogen high overhead and set them glowing — green and red from oxygen, blue and violet from nitrogen. Earth's magnetic field steers the display toward the poles.

From fireflies to deep-sea fish to drifting plankton, many living things brew their own glow through a chemical reaction that runs cold, wasting almost no heat. Evolution has hit on the trick independently dozens of separate times.

Mercury sits closer to the Sun, yet Venus is the hottest planet: a dense carbon-dioxide atmosphere traps heat until the ground glows near 465 °C. Above it drift clouds of sulfuric acid, and the air bears down as hard as ocean water a kilometre deep.

A chameleon shifts hue by rearranging tiny crystals in its skin that bend light differently — a tool as much for signalling mood and temperature as for hiding. Each eye also swivels on its own, giving it a near all-round view.

Lightning is a sudden discharge that neutralises the charge built up between clouds, or between a cloud and the ground. The bolt heats the air along its path to about 30,000 °C in an instant, and that explosive expansion is the thunder you hear.

The mantis shrimp strikes with clubs that accelerate like a fired bullet, so fast the water around them flashes into vapour. Its eyes are just as extreme, carrying many more kinds of colour receptor than a human's.

When a giant star collapses, its core can be crushed into a neutron star — about a Sun's worth of mass squeezed into a ball the size of a city. The matter packs so tightly that a sugar-cube's volume would weigh as much as a mountain.

Emperor penguins breed in the depth of the Antarctic winter. The male balances the single egg on his feet and huddles through months of darkness and brutal cold without eating, until the chick hatches and the female returns with food.

Everest reaches 8,848.86 metres above sea level, its summit straddling the Nepal–China border. India's slow collision with Asia keeps lifting the whole Himalaya a few millimetres a year, so the mountain gains a little height each century.

Reaching some 30 metres and close to 200 tonnes, the blue whale is the largest animal ever known — a heart the size of a small car, and a low call that carries for hundreds of kilometres through the ocean.

Jupiter's mass is about two and a half times that of every other planet in the Solar System put together. Its Great Red Spot is a storm wider than Earth that has been churning for centuries.

The Venus flytrap shuts only when prey brushes its trigger hairs twice within about twenty seconds — a built-in tally that ignores raindrops and stray debris. Further touches then tell it how hard to seal and start digesting.

The Colorado River spent millions of years slicing the Grand Canyon more than a mile down through Arizona's rock. Each exposed band is an older page of the planet's past, the deepest laid down close to two billion years ago.

Finished in 1945, ENIAC was the first general-purpose electronic computer — thirty tonnes of wiring and some 18,000 vacuum tubes. Reprogramming it meant physically rewiring the machine by hand, a job that could take days.

What looks like tens of thousands of separate aspens in Utah is a single organism: every trunk sprouts from one shared root system and carries identical genes. By weight, Pando is among the largest and oldest living things on Earth.

Over billions of years, Earth's tides dragged on the Moon until its spin fell into step with its orbit. It now turns exactly once each lap, so the same near side always points our way and the far side stays out of view.

Running more than 2,300 kilometres off Australia, the Great Barrier Reef is the largest structure any living creatures have ever built — the work of countless coral polyps, each smaller than a fingernail, laying down stone over thousands of years.

Give a paper strip a half-twist before joining its ends and you get a Möbius strip: a surface with a single side and a single edge. Run a pen along it without lifting and you'll cover the whole thing before arriving back where you started.

Working on Charles Babbage's unbuilt mechanical engine in the 1840s, Ada Lovelace saw what he had missed: that such a machine could move beyond arithmetic to work with any symbols, even music. Her notes contain what many call the first computer program.

Raised from an ancient wreck off a Greek island, the Antikythera mechanism is a hand-cranked bronze device from the 2nd century BC. Its dozens of interlocking gears could predict the positions of the Sun and Moon and the timing of eclipses years ahead.