Find the next move when the rhythm changes.
The arrow and dot count follow separate patterns. Choose the next tile.
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Two patterns, one answer. Pick a tile.
When AI is wrong, will you notice?
Undumb is a 10-minute daily workout to practice independent judgement and exercise the parts of your brain that need it most.
Focus
Reason
Recall
9:41
Wednesday
Good morning
Today’s mind workout
10 min
3
this week
Today’s focus
Deep reading + evidence
Focus
74Reason
82Recall
68Read closely. Challenge the narrative
Undumb reasoning set
1 of 5
An online marketplace piloted a ranking model that promoted unfamiliar sellers. Buyers exposed to the model purchased from a wider range of sellers and returned more often 30 days later. The company concluded that seller diversity increased retention.
However, the pilot was offered only to buyers who had previously browsed at least five seller pages. The treatment also shortened the delivery estimates shown on product cards.
Which additional finding would most seriously weaken the company’s interpretation?
Strong reasoning.
That result removes both plausible confounders and eliminates the observed lift, directly weakening the claim that seller diversity caused retention.
Games and tests to reclaim your brain.
Compress without flattening the truth.
Source draft
Although the beta performed better on engagement, we should probably avoid launching it globally right now because the experiment was short, the sample excluded new users, and support contacts increased.
≤ 45 wordsLead with the decisionName the tradeoff
0 / 45 words
One strong answer
Hold the global launch. The beta raised engagement, but the short test excluded new users and increased support contacts. Extend the experiment to a representative cohort before deciding whether the engagement gain justifies the operational cost.
Measure progress on the cognitive functions that matter to you.
Daily practice adapts to your goals.
Example report
Your cognitive profile
Last 12 weeks ⌄
3tracked areas
Deep focus 74
Reasoning 82
Recall 68
Session consistencySteady practice
8 sessions90756045
MayJunJul
This month’s insight
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You reason well with short passages. Accuracy drops when context exceeds 900 words.
Next week adds two longer reading sessions while keeping the subject matter familiar.
Next checkup
August 12
18 minutes · 5 skill areas