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Features
Everything it does
What's new first, then each feature in plain words.
What's new
The heart, closer to life
The atlas’s heart now has the yellow fat that fills its grooves, with each coronary artery and vein lying in it, and two stray veins that floated beside it in the close-up are gone.
Into the heart: the zoom ladder
From the heart’s close-up in the atlas, zoom in one rung at a time: a centimetre of its wall, with the muscle fibres turning as they go deeper; one muscle cell, banded with the sarcomeres that shorten on every beat; and one mitochondrion, cut open, making the ATP the beat runs on, with the mitochondrion’s own DNA leading on to DNA. Each rung is at its true size, and a strip of rungs lets you climb back up or down.
A real heart, in the simulations and the atlas
The blood loop and One heartbeat now show a heart of our own, built to a man’s measured sizes: four hollow chambers with their walls, the valves with their leaflets and cords, the great vessels, and the coronary arteries on its surface. It beats as a heart does, the walls thickening as it squeezes, and the red cells take the real way through it. The atlas shows the same heart, every part with its card.
Genitals remodelled
In the Full view his genitals are new: circumcised, with the glans in its own colour, the scrotum hanging over the testes with its fine folds, and pubic hair that lies low and curly. Everything inside now stays inside.
The body in full
The atlas’s genitals key now offers Full, beside Covered, Fig leaf and Blurred: the body as an anatomy textbook shows it. Covered stays the default, and your choice is remembered on your device.
How to move the body, at the foot of the atlas
The status bar shows each control with its icon: the mouse’s on a computer, the fingers’ on a touch screen, whichever you use. On a phone or an upright tablet, the ? key by the camera’s keys opens it. Two fingers now move the body on a touch screen, and the count of parts on show is always there.
Four new chapters, and a gene to play with
The blood loop now follows the cell out through the arteries, from the aorta to the arterioles; One breath goes in through the nose and down the throat; A bite of food stops at the liver; and in DNA you can change the haemoglobin gene's codon yourself and see what each change does.
The journey to life, complete
Three new chapters finish the journey: the fetus from week 10 to week 20; the last months to week 40, with a week slider and its size and weight at every week; and birth, seen in a cut through the pelvis, from the first contractions to the first breath and the placenta. Drawn in code, at true scale.
A page for wrong turns
An address that leads nowhere now opens a page of its own: a red blood cell that slipped out of its capillary, drifting in the plasma, with the heart beating far off. It shows a pulse, how far the cell is from the heart and its search for the way back, then the way home, the main pages and every chapter of the journey to life.
Quicker, and fewer snags
The atlas is ready much sooner, most of all on a phone, and the fine surface of skin, muscle and bone now shows as it was meant to. Find shows every part by its plain name and finds a muscle with its ends. Leaving an organ close-up for a simulation and coming back works as it should, the arrow keys no longer change a chapter while you move a slider, and the quiz ends when you open Find. Keyboard and screen-reader users keep their place when a list is redrawn, and hear which result Find is on. In the simulations, more than a dozen small things now look as they should, from the vein’s valves to the air in the lungs, and with reduced motion turned on a chapter no longer glides or turns by itself.
Nails like real ones
The fingernails and toenails now lie on the backs of the fingers and toes as real ones do, instead of sitting like caps on the tips. They are pink, lit through by the nail bed, with a whiter free edge; they lie in a shallow bed, level with the skin, their roots and sides tucked under the nail folds with a crease along each, and no skin shows through them from any side. The fingernails have measured sizes, thickness and curve: the thumbnail flattest, the little finger’s most curved. Every nail reaches almost to the tip of its finger or toe.
Clearer for the keyboard
Every key, chip and switch now shows the same clear ring when you reach it with the keyboard, and whatever cannot be used yet is dimmed the same way everywhere. Small text on the site’s pages is a little larger.
A steady frame for the atlas
On a computer the atlas is now one frame that stays: the panels down each side, the body always in the middle, and a status bar at the foot. The panels fold only sideways. On a wide screen the right-hand panel is always there, with a few organs to start with until you pick a part, and the compass stands at the top corner of the view.
Tidier Layers and Systems
In the atlas, each switch in Layers has its own row, and every layer and system ends with an eye, struck through when it is hidden. Systems puts By system and By region side by side, and its one-press views now end with All and None.
The body breathes
While you look at it, the body breathes, slowly, the chest widening and the belly rising, and then it rests. The organ close-ups have finer models of their own, made in Blender from the source anatomy, so their surfaces and outlines are smoother; cartilage is smooth and glossy beside the bone; and the backdrop behind the body is clean, with no grain.
A more real body
The body is lit by a studio of our own, made in Blender, and casts soft shadows. Muscle has fibres that run the way each muscle pulls, bone a porous surface, fat its lobules, and organs a wet sheen; no part is one flat colour any more. Thin skin, at the ears and fingers, glows warm where light passes through it, and the heart beats gently in its close-up.
Two more organs, and an easier panel
The intestines and the pancreas now open close up too, each with its own sourced fact sheet: the small intestine’s 30 square metres of inner surface, the 38 trillion bacteria of the gut, the pancreas’s islets that make insulin. In the atlas, Systems has one-press views (organs, skeleton, muscles, heart and vessels, nerves), each region has its own small figure and lists its largest groups, Find sorts organs from single parts, each layer can be made see-through, and a part’s card says what it does and where it lies. Share the view from a part’s card or the camera keys; on a phone, Find, Layers and Learn are labelled at the top.
Picking a part, clearer
Pick a part and the rest of the body fades to a see-through ghost, the part solid where it lies, even deep inside: the heart in the chest, the stomach under the ribs. A region shown on its own lists its main parts and has its own search, and a part’s card lists what it is made of, each to pick, with a key to pin its name on the body. The fading can be turned off in Settings.
The body by region
Systems has a second way to look at the body: by region. Pick the head and neck, the chest, the abdomen, the pelvis, the back, the arms or the legs, and that part of the body is shown on its own, every system in it, with the camera turned to it. Press it again for the whole body. And each layer and system now has its own small icon, in its own colour.
A camera that goes where you point
Scroll or pinch to zoom, and the camera goes toward the spot you point at. Double-click a spot to centre on it, and the camera eases toward a part when you pick it (you can turn that off in Settings). From the keyboard, the arrows turn the body, plus and minus zoom, and Home goes back to the start. Names come on the body as you come closer, and a link you share opens on the view you see. Taking the body apart, a bar at the foot sets how far apart, and a key by the compass turns to a three-quarter view. To peel the body, drag down beside the layers, or pick one.
A new atlas, and a compass
The atlas is laid out anew. Down its side, a rail of what you can do: Find, Layers, Systems, Organs, Look, Learn, Settings and About, each a section that fits without scrolling. What you pick opens on the other side, and the body stands in the middle between them. A compass on the view turns with it: click a side to look from there, drag it to turn the body, and it says in words which way you are looking from. On a phone the rail is a drawer, and cards rise from the foot.
Organs close up
The heart, the kidneys, the brain, the lungs, the liver and the eye, each on its own, close up. Turn it, pick its parts (the heart’s chambers, valves and vessels; the brain’s lobes), and read a fact sheet where every number says where it comes from and whether it was measured or is an estimate. Each has its own address to share. Open them from Organs in the atlas, or from a part’s card.
A fig leaf
Look has a new way to cover the body: a fig leaf, front and back, in place of the shorts. The leaf is modelled by us, its veins and all.
Learn: lessons and a quiz in the atlas
A new Learn key in the atlas. Short lessons walk you through the heart’s four chambers and the blood’s path, and the digestive tract from the gullet to the rectum, one part at a time: two lines, a number labelled measured or estimate, and its source, ending in the simulation that shows the same organs at work. The quiz asks you to find five parts on the body, in plain words, with three hints if you need them, and scores what you find without being shown. Each lesson and the quiz has its own address to share.
A touch becomes a thought
A new simulation, four chapters: a press on the skin of a fingertip squeezes a Meissner corpuscle and its nerve ending fires a spike; the spike jumps from node to node along a nerve wrapped in myelin; at a synapse a vesicle fuses and a few thousand molecules of glutamate cross a gap 20 nm wide; and the signal arrives in the strip of cortex that maps the body, about 25 thousandths of a second after the touch. A card on Simulations and the menu open it.
Inside a cell
A new simulation, four chapters: a whole cell cut open at its real size, how two metres of DNA are folded into the nucleus, the tiny motors that make energy for the cell, and the factory that makes and ships proteins along tracks to the surface.
DNA
A new simulation, five chapters at the scale of a nanometre: the double helix, a replication fork copying it, RNA polymerase reading a gene, a ribosome building a protein from the RNA, and the single changed letter that causes sickle cell disease. All of it from a real stretch of the haemoglobin gene.
A bite of food
A new simulation, four chapters: the swallow, a ball of food pushed down the gullet by a wave of muscle; the stomach, churning it against the acid and letting only fine pieces out; the villi of the small intestine, where sugars, amino acids and fats are taken in; and the large intestine, where tens of trillions of bacteria eat the fibre we cannot.
The eyes and seeing
A new simulation, four chapters, each closer in or further out: how the lens focuses on far and near, how the rods and cones of the retina catch single photons of every colour, how the optic nerves cross on their way to the brain, and how the visual cortex starts to build a picture from edges.
One breath
A new simulation: one breath from the air to a red blood cell, four chapters, each closer in. The diaphragm draws the air in; the lining of the windpipe filters it with cilia and mucus; the airways branch 23 times, and you follow one oxygen molecule down the whole tree; and at the end it crosses the wall of an air sac, a third of a micrometre thick, and binds to haemoglobin in a red cell.
One heartbeat
A new simulation: one beat of the heart in slow motion, with the electrical signal that drives it. The pacemaker fires, the wave spreads over the atria, waits at the AV node, races down the bundles to the bottom of the heart and sweeps up the ventricles, which squeeze; the valves shut with their "lub" and "dub", and a live ECG trace in the corner draws the same beat. Four chapters.
The blood loop: the whole lap
A new simulation. Follow the blood from the great vein into the right side of the heart, through the valves and out toward the lungs, one beat at a time, in slow motion; then into one air sac of the lungs, where a red cell, drawn at its true size, picks up oxygen and turns bright red; and back into the left side of the heart, with the thickest wall, which throws it out into the aorta; and into a muscle, where it hands its oxygen over to the cells that use it and turns dark red; and back up through the veins, with their one-way valves and the muscle that squeezes them at every step, into the right atrium where it began. Five chapters, one lap.
The size comparer
A human egg, a hair, a sperm cell, a red blood cell, a bacterium and a virus, side by side at true scale with a scale bar. Zoom from a hair down to a virus, or pick one to bring it to the middle. A hair is about 700 viruses wide. See it in 3D to turn each one: the egg in its shell, a red blood cell, a virus with its spikes.
My body in numbers
Enter your age and see how many times your heart has beaten, how much blood it has pumped, how many breaths you have taken, how many cells your body has replaced and how many years you have slept. Add your weight and height for how much blood, water and skin you have. You can keep a card with your numbers, or send it. It is worked out on your device, every figure is an estimate with its range, and nothing is sent or kept.
Show layers, and a steadier camera
In the atlas, Show layers lines the layers up side by side, from the skeleton to the skin; Show parts lays out every part, as Explode did. Find is now at the top of the panel, the camera turns round the body and stays outside it, and on a phone the panel starts folded.
Hair and eye colour
Beside the skin tone, choose the body's hair colour (the brows and lashes follow it) and eye colour. Like the skin tone, they are remembered on your device, and nowhere else.
Blurred, as well as covered
On the new Look tab of the human atlas, the genitals can now be blurred instead of covered by shorts. Covered is still how the body first appears.
The front door, in two languages
The front door, Simulations, Privacy and Terms are now pages in both English and Hebrew, with a card for each chapter of the journey on the Simulations page, and new pages: How we know, About and this one.
A new look and a new mark
The human body and the journey now have their own addresses, with shared colours and type, navigation, a dock for phones and a new mark: an eye.
Scroll to peel
On the human page, scrolling over the body peels it layer by layer, and scrolling over empty space zooms.
The anatomy the open model leaves out
The anal canal, the pericardium and the third molars are now modelled and marked as ours. The caecum, ileum and rectum are named where the open model already held them.
Fat and tendons
A layer of fat under the skin, and tendons shown pale where the muscles thin into them.
Chapter 10: the embryo
Weeks 4 to 10, from a flat disc to a tiny person with a beating heart, drawn in code, with a week slider.
Six skin tones
Choose the skin tone of the body; it is remembered on your device, and nowhere else.
The atlas
- Peel the bodySeven layers, from the skin and the fat under it through the muscles, the organs, the heart and vessels, and the brain and nerves, to the skeleton. Scroll over the body, or drag the slider.
- A card for every partMore than 3,400 named parts. Click one for a plain explanation, the science behind it and its real numbers, each one labelled.
- Fifteen systemsShow or hide the body by what it does: the skeleton, the muscles, digestion, breathing, the blood and more.
- Find a partSearch by name, in English or in Hebrew, and the body turns to it.
- Take it apartLay the body out part by part, show one part on its own, or turn to the front, the side or the back.
- A tour of the bodyTen stops, from the brain to the thigh bone, moving on by themselves.
- LearnShort lessons, part by part, each number labelled and sourced; and a quiz that asks you to find parts on the body, with hints.
- How it looksSix skin tones, six hair colours and six eye colours, and the genitals covered or blurred, on the Look tab. Remembered on your device only.
The journey to life
- Thirteen chaptersFrom the vagina to birth and the first breath, each one a scene in 3D.
- True scale, at any speedReal sizes, with a scale bar. Slowed to a quarter or a half to be seen, or at real speed.
- The countHow many sperm cells are still in the race, then how many cells, days and weeks.
- Where you areA map of the body marks the place of each chapter.
- Week by weekA slider takes the embryo and the fetus from week 4 to week 40, with its size and weight at every week.
Honest about every number
- Three labelsEvery number is measured, an estimate or drawn, and says which.
- SourcesEvery figure comes from the medical literature. The sources are in About and on How we know.
For everyone
- English and HebrewEvery page in each language, and the whole site mirrored for Hebrew.
- Free, with no accountNothing to sign up for, no ads and no tracking.
- Phones and tabletsA layout for each, and a lighter picture to save battery, in Settings.