Chemistry
Best Gifts for Chemists: 18 Chemistry Gifts Chemists Actually Want
November 8, 2026
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Chemistry
Best Gifts for Chemists: 18 Chemistry Gifts Chemists Actually Want
November 8, 2026
Science
Best Science Kits for Adults: 13 Kits I Actually Use at Home
November 7, 2026
Physics
Best Breadboard Kit: 11 Picks for Beginners, Arduino and Raspberry Pi
November 7, 2026
Chemistry
Best Lab Safety Goggles: 6 Splash-Rated Picks From the Bench
November 7, 2026
Before you buy
Books and gear for science readers, students and classrooms, with the specs and editions checked for every pick.
Best Science Gifts for Kids
A seven-question gift quiz plus picks by age from 3 to teens: real microscopes, Snap Circuits, geodes, telescopes, coding robots, games and books.
Best Gifts for Chemists
Eighteen gifts chemists actually want: a glass coffee siphon, element cubes, a tungsten cube, an anti-static gun, student tools and the best chemistry books.
Best Science Kits for Adults
Thirteen science kits for adults: a serious chemistry set, a Geiger counter, a Stirling engine, a mushroom kit, a rock tumbler and more.
Free to print
Periodic tables, conversion charts and worksheets as free PDFs in US Letter and A4, with answer keys for the quizzes.
Weight Conversion Chart
Kilograms to pounds and pounds to kilograms for every body weight, plus ounces, grams and a units table.
Height Conversion Chart
Feet and inches to cm and cm to feet and inches, from 4 to 7 feet, with meters on every row.
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.
Fresh from the lab
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Microbiology
How to Clean Petri Dishes: Glass, Plastic and Used Agar Plates
Glass petri dishes are cleaned in four stages: decontaminate, remove the agar, wash, sterilize. Disposable plastic dishes get…
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Chemistry
How to Clean a Bunsen Burner in 6 Steps
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Physics
What Are Mesons? Quark-Antiquark Pairs Explained
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Medicine
Medical Devices: What Counts and How They’re Classified
A medical device is any instrument, machine, implant, software or material used on people to diagnose, monitor, treat…
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Geography
Natural Resources of England: What It Has and Where
Table of Contents TLDR: The short list The main natural resources of England are farmland, water, wind, natural…
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Physics
15 Examples of Elastic Potential Energy (With Numbers)
Elastic potential energy is the energy stored in an object when you stretch, compress, bend or twist it,…
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Science History
25 Scientists Born in Italy and What They Discovered
Italy gave the world the telescope’s first great user, the battery, the radio, the first nuclear reactor and…
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Chemistry
Examples of Esters: Smells, Uses, and Formulas
An ester is an organic compound with the group RCOOR’, a carbonyl carbon (C=O) bonded to an oxygen…
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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.
