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Big Ideas

+1

A falling ruler can clock your reflexes

Nov 5, 2026

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2 min read

A falling ruler can clock your reflexes

Reaction distance is just d = v × t, and it is longer than it sounds. A ruler-drop demo for Monday and a free practice sheet.

Waves & Light

+1

A red flashlight can't wake a glowing ghost

Oct 30, 2026

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3 min read

A red flashlight can't wake a glowing ghost

Brightness isn't the same as photon energy. Plus a 5-minute ghost-writing demo for Monday.

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He lost the party game again (and Thanksgiving is coming)

Oct 25, 2026

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1 min read

He lost the party game again (and Thanksgiving is coming)

A rematch update on My Cat Joined a Flat-Earth Group

Big Ideas

Why doorknobs start shocking you in the fall

Oct 22, 2026

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2 min read

Why doorknobs start shocking you in the fall

One Big Idea, five minutes: it's the air, not the doorknob

Waves & Light

+1

Your mirror doesn't flip left and right

Oct 15, 2026

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1 min read

Your mirror doesn't flip left and right

One Big Idea, five minutes

launch

My cat joined a flat-Earth group (and we have receipts)

Oct 11, 2026

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1 min read

My cat joined a flat-Earth group (and we have receipts)

A long-weekend read with a horizon, a notebook, and a very smug cat

Big Ideas

+1

The ghost force in your car isn't real

Oct 1, 2026

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1 min read

The ghost force in your car isn't real

One Big Idea, five minutes

Big Ideas

+1

Going up doesn't always make you heavier

Sep 24, 2026

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2 min read

Going up doesn't always make you heavier

Four elevator situations, a classroom-ready answer key, and your next Forces lesson.

Big Ideas

+1

A firefly hits a bus with equal force

Sep 10, 2026

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2 min read

A firefly hits a bus with equal force

Equal force does not mean equal acceleration. Newton's third law for Forces week.

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