ENRICHMENTTHE 102 PLATFORM
Daily picks · 2026-09-25 · Central TimeSwipe to discover

You go to sleep. Your brain changes shifts.

Sleep cycles through REM and three non-REM stages. Their proportions change through the night.

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Your mirror has a geometry trick.

For a flat mirror, the angle of reflection equals the angle of incidence, measured from a line perpendicular to the surface.

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A lever trades force for distance.

With the right pivot arrangement, applying force over a longer distance can move a heavier load through a shorter distance.

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Me: “I’m open to being wrong.”

Also me when the evidence arrives: “Who invited you?”

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What has keys but cannot open a lock?

The blank page can teach you what rereading hides.

In two experiments, recalling prose improved delayed retention more than repeated study. Immediate test results differed.

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A solution can look empty while containing plenty.

Dissolved substances can be spread through a liquid at a molecular or ionic scale, too small to see individually.

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Can your belief survive its strongest opponent?

In On Liberty, Mill argues that a belief needs to face serious objections. Winning against a weak argument proves very little.

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You pass the runner in second place. What place are you in?

When you review is part of what you learn.

In a study of over 1,350 people, retention depended on both the time between reviews and the delay before testing.

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Paradox

(PAIR-uh-doks)

An apparent contradiction that invites closer examination.

The idea that less choice can make decisions easier seems like a paradox.

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