The body, inside out.

The systems that keep you going, drawn to be read, with the numbers kids love: bones, heartbeats, cells.

Reads alone from about 7; a parent reads the margin aloud before that.

Prints in 2 to 5 business days, then 3 to 4 to your door. Shipping is $4.99 for an 18x24 and $7.99 for a 24x36, plus 40 cents for each poster after the first. US addresses only.

Checked by Rob Oller Edition 2026-10 Sources listed below

in-frameThe poster in its 18x24 frame on a painted wall, straight on, whole frame in shot.

child-heightThe poster on a kid's bedroom wall, shot from a seven-year-old's eye height, a kid reading it.

margin-close-upThe margin facts, close, sharp enough to read, to show the type size and the paper.

unboxingThe kraft box as it arrives, and the rolled poster coming out of it.

What Is On This Poster

9 facts

The facts this poster carries, so you can match it to what your kid is asking about before you buy.

An adult has 206 bones; a newborn has about 270 to 300, and some fuse as they grow.
A grown-up's heart beats about 100,000 times a day.
A grown-up's body is made of about 30 to 37 trillion cells; a 10-year-old's has about 17 trillion.
An adult has about 5 liters of blood.
The smallest bone is the stapes in your ear, about 3 millimeters long.
Your skin is your largest organ.
Your thigh bone, the femur, is the longest and strongest bone.
Each optic nerve carries more than a million nerve fibers (about 1.2 million) from eye to brain.
Most anatomy books count 11 organ systems in the body.

Sources

Every source for every poster, and every correction, is on the sources and corrections page.

Fits These Frames

in-frame-18x24The sample 18x24 in a standard 18x24 frame from a big-box store, the frame's brand visible on the back.

18 x 24 Inches

Fits a standard 18x24 frame, the usual size for art prints, sold at big-box stores.

Printed sizes can run a little over, so the design keeps everything that matters clear of the edge and the frame hides nothing.

in-frame-24x36The sample 24x36 in a standard 24x36 poster frame, on a wall, with a door or chair for scale.

24 x 36 Inches

The most common poster size in the US, and the one budget frames are made for. Readable from across a room.

The same margin rule: nothing important sits near the edge.

Paper

189 gsm Matte Paper

Thick, smooth and glare-free. Printful, who prints it, calls it museum-quality paper.

Ink

Epson UltraChrome GS3

Pigment ink Printful lists as GREENGUARD Gold certified. Deep blacks, which a night sky needs.

Box

Rolled In A Kraft Box

No plastic caps. Unroll it face up, lay a clean sheet of paper on it with a few books on top, and give it a night. Damaged on arrival, we send another.