Nora Whitfield

Nora Whitfield taught high-school chemistry and physics for twenty-eight years, and she has never once answered "when will I use this?" with a sigh. She believes any honest question about how the world works deserves an answer that is both correct and actually understandable.

Articles by Nora Whitfield

Chemistry / Aug 22, 2026 / 22 min

Every Shelf in the Chemistry Lab, and the One Job Each Tool Does Best

A working tour of chemistry lab equipment and techniques: what each tool does best, how to measure well, and how to separate what you made.

Chemistry / Aug 22, 2026 / 19 min

The Whole Metals and Alloys Family, Sorted by What Holds Them Together

Metals and alloys run on one trick: loosely held electrons. What makes a metal, why alloying is deliberate engineering, and how the branches connect.

Chemistry / Aug 22, 2026 / 22 min

The Periodic Table Predicts How an Element Behaves Before You Look It Up

A guide to the periodic table that treats it as a map: read one box, find its row and column, and predict how an unfamiliar element behaves.

Chemistry / Aug 22, 2026 / 26 min

Every Plastic on Your Desk Is the Same Trick Played Nine Ways

A chemistry teacher’s guide to plastics, polymers and everyday materials: how the chains are built, what the recycling numbers mean, and why it matters.

Social Sciences / Aug 22, 2026 / 23 min

Every Contact Leaves a Trace: How Forensic Science Answers What Happened

Forensic science and investigation, explained by a teacher: the transfer principle, the major branches, how evidence travels from scene to courtroom.

Social Sciences / Aug 22, 2026 / 22 min

Sociology and Philosophy Point Different Instruments at the Same Crowd

A teacher’s map of sociology and philosophy concepts: what each field asks, the instruments it uses, and which one to reach for when.

Biology / Aug 22, 2026 / 22 min

How Sunlight Becomes a Fox, and How Little of It Survives the Trip

Food chains and food webs run on sunlight that shrinks at every bite. How trophic levels, decomposers and the ten percent rule shape a whole ecosystem.

Biology / Aug 22, 2026 / 20 min

Every Species Interaction Comes Down to Plus, Minus, or Zero

All species interactions sort into six boxes by one question: does each side gain, lose, or stay even? Here’s the notation ecologists actually use.

Chemistry / Aug 22, 2026 / 27 min

Acids, Bases, and Solutions, Starting From a Pot of Purple Cabbage

Red cabbage juice turns pink in vinegar and green in baking soda. Start there and acids bases and solutions make sense: pH, strength, buffers, and safety.

Chemistry / Aug 22, 2026 / 21 min

How Atoms Bond, and Why the Compounds They Make Are Nothing Like Them

Atoms bonding and compounds, from the sodium-chlorine reaction that makes table salt to ionic, covalent, and metallic bonds and why compounds differ.

Chemistry / Aug 22, 2026 / 23 min

Every Square on the Periodic Table Is a Job Description

Chemical elements and their uses follow a pattern: where an element sits on the periodic table predicts the job it does in your house, car, and body.

Weather & Climate / Nov 28, 2014 / 31 min

The Three Engines Behind Every Storm on the Forecast Map

The different types of storms run on three engines: rising warm air, ocean heat, and clashing air masses. Learn which is which and why it matters.

Biology / Jul 17, 2014 / 21 min

The World’s Ecosystems Sort Themselves by Temperature and Rainfall

The types of ecosystems on Earth fall out of two dials: temperature and rainfall. Here’s the working map of terrestrial and aquatic ecosystems.

Chemistry / Jul 10, 2008 / 21 min

Every Chemical Reaction You Meet Fits One of About Six Patterns

The five types of chemical reactions (plus redox and acid-base), the clues that identify each on sight, and how to classify a reaction you’ve never seen.