What everything is made of.
What an atom is, how atoms join into molecules, and how small the smallest things get.
Reads alone from about 8; 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
8 factsThe facts this poster carries, so you can match it to what your kid is asking about before you buy.
- An atom is a nucleus of protons and neutrons with electrons around it.
- An atom is mostly empty space: the nucleus is tens of thousands of times smaller across than the atom.
- A water molecule is two hydrogen atoms and one oxygen atom: H2O.
- A glass of water holds more atoms than there are glasses of water in all the oceans.
- A molecule can be one element, like oxygen gas (O2), or several joined together; a compound has at least two different elements.
- Diamond and graphite are both pure carbon, with the atoms arranged differently. The gray core of a pencil is graphite mixed with clay.
- Electrons and quarks have no size anyone has measured: physicists treat them as points.
- Everything you can touch is made of atoms. There are 118 known kinds, called elements, and about 90 of them are found in nature.
Sources
- CERN: the Bohr model
- OpenStax Anatomy and Physiology: elements and atoms
- NIST: the Avogadro constant
- NOAA: How much water is in the ocean?
- Royal Society of Chemistry: Carbon
- USGS: graphite
- The size of the electron (arXiv)
- US Department of Energy: electrons
- IUPAC: names of elements 113, 115, 117 and 118
- LibreTexts Chemistry: the elements
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.
189 gsm Matte Paper
Thick, smooth and glare-free. Printful, who prints it, calls it museum-quality paper.
Epson UltraChrome GS3
Pigment ink Printful lists as GREENGUARD Gold certified. Deep blacks, which a night sky needs.
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.
