Geography
Geography Topics for Essays, Talks and Research Papers
October 16, 2026
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Geography
Geography Topics for Essays, Talks and Research Papers
October 16, 2026
Chemistry
Acetic Acid vs Glacial Acetic Acid: What Actually Differs
October 16, 2026
Biology
Birds of São Tomé and Príncipe: The Endemic Species Guide
October 16, 2026
Biology
Examples of Reptiles: 30 Species Sorted by Group
October 16, 2026
Before you buy
Books and gear for science readers, students and classrooms, with the specs, prices and editions checked for every pick.
Free to print
Periodic tables, conversion charts and worksheets as free PDFs in US Letter and A4, with answer keys for the quizzes.
Printable Periodic Table
Free periodic table PDFs in color, black and white, blank with a key, kids and an element list, plus a build-your-own customizer.
Periodic Table with Charges
Common ion charges on every element, in color and black and white, with a blank quiz and answer key.
Metric Conversion Chart & Worksheets
Chart, staircase poster, worksheets and quizzes for 3 levels, with answer keys. US Letter and A4 international versions.
Fresh from the lab
Geology
Volcanoes in Gabon: Are There Any? What the Rocks Say
TLDR Contents Does Gabon have active volcanoes? No. Gabon has no active volcanoes, no dormant ones that anyone…
October 16, 2026
Geology
Volcanoes in Djibouti: Where They Are and Which Erupted
TLDR Djibouti has five or six volcanic centers, depending on who is counting: Ardoukoba, Boina, Garbes, Manda-Inakir, Tiho,…
October 16, 2026
Biology
Genes Explained: What They Are and How They Work
A gene is a stretch of DNA that carries the instructions for making one specific product, usually a…
October 16, 2026
Earth Science
Earth Science Physics: The Physics That Runs the Planet
Earth science tells you what the planet is made of and what it has done. Physics tells you…
October 16, 2026
Science Basics
18 Examples of Scientific Laws (With Everyday Proof)
A scientific law describes what happens in nature, usually as a repeatable pattern or an equation. It doesn’t…
October 13, 2026
Biology
Mutualism: How Species Win Together, and When They Cheat
Mutualism is a relationship between two species in which both benefit. That’s the whole definition. Everything else, from…
October 13, 2026
Botany
Evergreen Trees: 14 Types, Sizes and Zones to Pick From
Evergreen trees keep living foliage on their branches all year, so they never go fully bare the way…
October 13, 2026
Geology
Examples of Silicate Minerals, Sorted by Structure
TLDR Silicate minerals are built from silicon-oxygen tetrahedra, and they make up roughly 90% of Earth’s crust. The…
October 13, 2026
Chemistry
12 Myths About Chemistry (and What’s Actually True)
Chemistry gets blamed for a lot: pollution, “toxins,” that mystery ingredient on the shampoo bottle. It also gets…
October 13, 2026
Why we publish
33Science is an independent publication exploring the natural world — from the chemistry of a single crystal to the life cycle of a star. Clear, curious and rigorously sourced, for readers of every background.
