Every fact has a source. Every poster has an edition.

Every poster lists who checked it, its edition and its sources. Find something wrong and we fix it.

A poster for a kid has to be right, because the kid will check. This is how we keep ours right.

Every fact on a poster has a source a scientist would accept, listed on the poster's page and in the table below.
Where good sources disagree, such as how heavy the biggest dinosaur was, the poster says so or the fact stays off.
Every poster carries an edition date in its margin. When the science moves, or we find a mistake, we correct the file and the edition changes.
Corrections are listed here, poster by poster.

Corrections So Far

None yet. The first editions are dated October 2026.

Every Poster, Its Edition And Its Sources

Poster	Edition	Checked by	Sources
Solar System Poster	2026-10	Rob Oller	NASA Science: Sun facts NASA Science: Dwarf planets Smithsonian National Air and Space Museum: light from the Sun NASA Science: Jupiter facts NASA Planetary Fact Sheet NASA Science: Neptune facts NASA Science: Venus facts NASA Venus Fact Sheet
Dinosaur Poster	2026-10	Rob Oller	Natural History Museum, London: When did dinosaurs live? Natural History Museum, London: What are dinosaurs? Natural History Museum, London: Stegosaurus Natural History Museum, London: Tyrannosaurus Natural History Museum, London: How dinosaurs got their name Encyclopaedia Britannica: Brachiosaurus San Diego Zoo: Giraffe Natural History Museum, London: Velociraptor American Museum of Natural History: Velociraptor Cornell Lab of Ornithology: Wild Turkey
Life Cycle Of A Star Poster	2026-10	Rob Oller	NASA Space Place: nebulas NASA Science: Stars NASA Science: Sun facts NASA Science: Types of stars NASA Imagine the Universe: Stars NASA Science: Neutron stars NASA Astronomy Picture of the Day: star colors NASA StarChild: elements made in stars
Black Hole Poster	2026-10	Rob Oller	NASA Science: Black Holes NASA Science: Anatomy of a black hole ESO: First image of the black hole at the heart of the Milky Way, 2022 ESO: First image of a black hole (M87*), 2019 NASA Imagine the Universe: Black holes
Cell Poster	2026-10	Rob Oller	Bianconi et al. 2013, number of cells in the human body Hatton et al. 2023, the human cell count (PNAS) The Royal Society: Hooke's Micrographia NHGRI: Nucleus NHGRI: Mitochondria NHGRI: Ribosome NHGRI: Cell membrane NHGRI: Introduction to genomics MedlinePlus: Blood Guinness World Records: longest cell BioNumbers (Harvard): cell sizes American Museum of Natural History: bubble algae Smithsonian Ocean: bubble algae Caulerpa, a giant single cell (Ranjan et al. 2015) BioNumbers (Harvard): ostrich egg
Tree Of Life Poster	2026-10	Rob Oller	Woese, Kandler and Wheelis 1990, three domains (PNAS) IUCN Red List described species, via Our World in Data Mora et al. 2011, how many species are there? The Linnean Society: naming nature Australian Museum record: red kangaroo Baldauf and Palmer 1993, animals and fungi
Atoms And Molecules Poster	2026-10	Rob Oller	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
Human Body Poster	2026-10	Rob Oller	NIAMS (NIH): learning about bones Cleveland Clinic: how many bones does a baby have? Cleveland Clinic: fun facts about your heart Hatton et al. 2023, the human cell count (PNAS) StatPearls: blood volume Stapes dimensions (CT study) MedlinePlus: the skin Cleveland Clinic: Femur The optic nerve (PMC) OpenStax Anatomy and Physiology: organ systems
Ocean Zones Poster	2026-10	Rob Oller	NOAA JetStream: layers of the ocean NOAA Ocean Service: How deep is the ocean? Nepal and China announce the height of Everest, 2020 NOAA: how far does light travel in the ocean? NOAA PMEL: pressure in the deep ocean Cornell: anglerfish and their glowing bacteria Seabed 2030: mapping milestone, April 2026
Periodic Table Poster	2026-10	Rob Oller	IUPAC: names of elements 113, 115, 117 and 118 LibreTexts Chemistry: the elements Royal Society of Chemistry: Gallium NASA Science: glossary USGS Circular 285: elements of the Earth's crust Royal Society of Chemistry: Mercury Royal Society of Chemistry: Bromine Guinness World Records: most common element in the body ICRP Reference Man: elements in the body

Report A Mistake

Checked And Sourced Who checked each poster, and where every fact came from.
Fits A Standard Frame 18x24 and 24x36, the sizes frames are sold in.
Printed To Order Printed when you order, in 2 to 5 business days, and shipped within the US.
Replaced If Damaged Rolled in a kraft box. Damaged on arrival, we send another.