Ikigai Daily

The examined world

Science

Experiments, discoveries and scale-shifting facts about matter, life and the universe.

498 entriesPage 14 of 21Context and sources

In this room

Follow the subject sideways.

Cards are connected by subject and by mood. Move through the complete sequence below, or cross into a neighbouring part of the archive.

87Drive
67Stillness
468Wonder
Q1450
WonderScience

The Greenland shark is the longest-living vertebrate known, with lifespans estimated at up to about 400 years — meaning some alive today were born before Shakespeare.

Living in the cold, dark Arctic deep, these sharks grow barely a centimetre a year and may not reproduce until around 150 years old. Scientists estimated their age by radiocarbon-dating the lenses of their eyes. A creature that measures its life in centuries is a quiet argument for patience: some things simply cannot be hurried into being.

Nielsen et al., Science (2016)Read card
Q1451
WonderScience

A jellyfish the size of a fingernail, Turritopsis dohrnii, can respond to stress or injury by reverting its cells to an earlier stage — effectively winding back its own biological clock.

Instead of dying, an adult can transform back into a polyp, the juvenile form it began as, and start its life cycle over. This has earned it the name 'the immortal jellyfish'. It doesn't cheat death entirely — predators and disease still catch it — but it blurs the line we assume is fixed between growing up and growing old.

Marine biology (Turritopsis dohrnii)Read card
Q1452
WonderScience

A returning honeybee tells the hive where food is by dancing: the angle of its 'waggle' encodes the direction relative to the sun, and its duration encodes the distance.

Decoded by Karl von Frisch, who won a Nobel Prize for it, the waggle dance is one of the few known symbolic languages outside humans. A bee that has found flowers a kilometre away can translate that journey into a figure-of-eight on a vertical honeycomb, in the dark, and dozens of others will read it and fly straight there. Communication, it turns out, did not wait for words.

Karl von Frisch (Nobel Prize, 1973)Read card
Q1453
StillnessScience

Sea otters often sleep floating on their backs holding paws with one another, forming groups called rafts so they don't drift apart on the current.

They may also wrap themselves in strands of kelp to stay anchored while they rest. Otters have no thick blubber like other sea mammals; they survive the cold on dense fur and constant effort. That a creature working so hard to stay warm and afloat still reaches out for another before sleep is one of nature's small, unforced tendernesses.

Marine biology (sea otters)Read card
Q1454
WonderScience

Venus spins so slowly that one full rotation — a Venusian day — takes longer than the time it needs to orbit the Sun. A day there is longer than its year.

Venus turns once every 243 Earth days, but circles the Sun in about 225. Stranger still, it spins backwards compared with most planets, so on Venus the Sun would rise in the west. It's a reminder that the rhythms we treat as universal — day, year, sunrise in the east — are just the habits of our particular world.

Planetary science (Venus)Read card
Q1459
WonderScience

Australia's superb lyrebird is one of the world's great mimics, able to reproduce the calls of many other bird species with startling accuracy, weaving them into its own song.

A male's display can run through a medley of other birds in sequence, each rendered so faithfully that the originals answer back. In captivity, individuals have even been recorded copying human-made sounds. It is courtship as performance: a bird proving its fitness not by force but by the sheer range of what it has listened to and remembered.

Ornithology (superb lyrebird)Read card
Q1460
WonderScience

The wood frog can survive winter frozen nearly solid: its heart stops, its blood stops flowing, and up to two-thirds of the water in its body turns to ice — then it thaws and hops away in spring.

As it freezes, the frog floods its cells with glucose, a natural antifreeze that keeps them from being destroyed by ice. For weeks it shows no heartbeat, no breath, no measurable brain activity — by most definitions, not alive — and then it simply resumes. Nature keeps a stranger set of doors between living and not-living than we usually allow ourselves to imagine.

Cryobiology (wood frog)Read card
Q1461
WonderScience

The blue whale is the largest animal known to have ever lived, reaching about 30 metres and 150 tonnes — larger than any dinosaur, with a heart roughly the size of a small car.

It feeds almost entirely on krill, tiny shrimp-like creatures a few centimetres long, swallowing several tonnes a day. A newborn already weighs more than an adult elephant and gains around 90 kilograms a day on its mother's milk. The mightiest body the planet has produced is built, quietly, from some of its smallest animals.

Marine biology (blue whale)Read card
Q1462
WonderScience

The air inside a lightning bolt can reach roughly 30,000°C — about five times hotter than the visible surface of the Sun.

That sudden heat makes the air expand explosively, and the shockwave is what we hear as thunder. The whole event lasts a fraction of a second, yet for that instant a thin channel of sky is one of the hottest places in the solar system. Immense power does not always mean lasting presence; some of it arrives and is gone before the sound catches up.

Atmospheric physicsRead card
Q1464
WonderScience

Mount Everest rises by a few millimetres each year, pushed up as the Indian tectonic plate keeps grinding into Asia.

The same slow collision that first raised the Himalayas roughly 50 million years ago has never stopped. Rock that now stands nearly nine kilometres up once lay on an ancient seabed — which is why fossil sea creatures can be found near the summit. The most solid, permanent thing you can imagine, a mountain, is in fact mid-motion.

Geology (Himalayan uplift)Read card
Q1468
WonderScience

The dazzling blue of a morpho butterfly's wings contains no blue pigment; the colour comes from microscopic structures that bend and reflect light.

Layers finer than a wavelength of light interfere so that mostly blue bounces back to your eye — the same trick behind a peacock's shimmer and some blue feathers. Crush the wing and the blue vanishes, because it was never a substance, only an arrangement. Some of the most vivid things we see are made of structure, not stuff.

Optics (structural colour)Read card
Q1470
WonderScience

The naked mole-rat can live past thirty — extraordinary for a rodent its size — and shows striking resistance to cancer and little of the rising death rate that age usually brings.

Living in dark underground colonies in East Africa, organised almost like insects around a single breeding queen, it feels no pain from certain acids and can survive with very little oxygen. Scientists study it not for oddity but for clues: an animal that ages so differently hints that the decline we treat as inevitable may be more negotiable than it looks.

Zoology (naked mole-rat)Read card
Q1471
WonderScience

At the equator, Earth's rotation carries you eastward at more than 1,600 kilometres an hour — and you feel nothing at all.

You sense motion only when it changes, and the planet's spin is almost perfectly steady, so it stays invisible to your body. On top of that, Earth is racing around the Sun at about 30 kilometres a second. Stillness, it turns out, is never truly still; it is only motion so smooth and so shared that everything around you moves with it.

Astronomy (Earth's rotation)Read card
Q1506
WonderOcean

A century after the colossal squid was named, one was finally filmed alive in the deep sea: a young, glass-clear individual about 30 cm long, drifting 600 m down near the South Sandwich Islands.

On 9 March 2025, the research vessel Falkor (too) and its robot SuBastian caught the footage; squid experts Kat Bolstad and Aaron Evans confirmed it. The species was formally named in 1925 but had only ever been known from remains in the stomachs of whales and seabirds. Adults may reach 7 m and 500 kg — the heaviest invertebrate on Earth.

Schmidt Ocean InstituteRead card
Q1507
WonderSpace

In July 2025 astronomers spotted 3I/ATLAS — a comet from another star system, only the third interstellar object ever detected passing through our Solar System.

The NASA-funded ATLAS survey telescope in Chile reported it on 1 July 2025. It was moving at roughly 137,000 mph — too fast for the Sun to hold — on a path that will fling it back out of the Solar System. It rounded the Sun just beyond Mars's orbit in October 2025 and had drifted through interstellar space for perhaps billions of years before arriving.

NASA / Minor Planet CenterRead card
Q1509
WonderNature

In 2025 scientists watched killer whales tear off lengths of kelp and roll them between their bodies to groom one another — the first known tool made and shared by marine mammals.

Drone footage of southern resident orcas in the Salish Sea, off the US–Canada coast, revealed the behaviour researchers named 'allokelping.' A whale bites off a stalk of bull kelp and presses it against a partner, and the two roll it along their skin. Making a tool and using it on a companion is something very few animals are known to do.

Current Biology (2025)Read card
Q1510
WonderSpace

When NASA opened its sample from asteroid Bennu, it found amino acids and all five of the 'letters' that spell out DNA and RNA — the chemistry of life, made in space.

OSIRIS-REx returned about 120 grams of Bennu to Earth in 2023; the first deep analyses were published in Nature in January 2025. The dust held 14 of the 20 amino acids life uses to build proteins, the five nucleobases of DNA and RNA, and salty minerals left by ancient water. None of this is life — but it shows the ingredients were riding on asteroids long before Earth.

NASA (Nature, 2025)Read card
Q1511
WonderHealth

In 2025 doctors treated an infant known as 'Baby KJ' with a personalized CRISPR-based gene-editing therapy designed for his specific mutation.

KJ was born with CPS1 deficiency, a rare disorder that lets ammonia build to toxic levels. A team at the Children's Hospital of Philadelphia and Penn designed, tested and delivered a bespoke gene-editing therapy in roughly six months. He improved and went home — a proof of principle that treatments might one day be tailored to a patient in weeks.

Children's Hospital of Philadelphia / Penn MedicineRead card
Q1512
WonderScience

The 2025 Nobel Prize in Chemistry honoured metal-organic frameworks — crystals so full of tiny pores that a spoonful can hold the surface area of a football field, enough to pull drinking water straight from desert air.

Susumu Kitagawa, Richard Robson and Omar Yaghi were recognised for building MOFs, lattices of metal nodes linked by carbon struts that leave vast open space inside. Because that space can trap chosen molecules, MOFs are being developed to harvest water in deserts, capture carbon dioxide, and store gases — architecture at the scale of atoms.

Nobel Prize in Chemistry 2025Read card
Q1513
WonderScience

In 2025 researchers recovered proteins from the tooth enamel of a rhino relative that lived up to 24 million years ago — shattering the old limit for how far back such molecules survive.

The enamel came from a fossil in Canada's High Arctic, where deep cold preserved the fragile molecules. Proteins had previously been read back only about 3.5 million years, and DNA only around 2 million. Because enamel is the hardest tissue in the body, it may become a time machine for studying creatures long past the reach of ancient DNA.

Nature (2025)Read card
Q1514
WonderHistory

A massive fossil skull nicknamed 'Dragon Man,' hidden in a Chinese well for decades, was identified in 2025 as a Denisovan — finally giving a face to a human cousin known mostly from DNA.

The Harbin skull, about 146,000 years old, had puzzled scientists since it resurfaced. In 2025, ancient proteins and DNA recovered from it linked it to the Denisovans, a group first identified in 2010 from a finger bone in Siberia. For years Denisovans were a genome without a face; now one of the best-preserved skulls of an archaic human has a name.

Science / Cell (2025)Read card