THE INTERACTIVE EXPLAINERS
Don’t just read it.
Try it.
Four small experiments. No timer, no judgement. Change something and see why the answer changes.
TRY THE IDEA · NO TIMER · NO RANKING
Move one number. Watch the average.
Keep four values fixed. Change only the last one.
Mean 6.0
Median 3
The median stays at 3. The mean moves because every value contributes to the total. Neither result is broken: they summarise the list differently.
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Same percentage. Different starting point.
Start at 100. Reduce it, then increase the new amount by the same percentage.
- Start 100.00
- After reduction 80.00
- After increase 96.00
The rise applies to 80.00, not to the original 100. Try 0%, 20% and 50% to see the difference.
TRY THE IDEA · NO TIMER · NO RANKING
One sentence, two scenes.
“The visitor saw the guide with binoculars.”
Explore either reading. Both are possible.
The original sentence alone does not choose between these scenes.
Possible alternatives do not establish that both people had binoculars. The careful answer is that we cannot tell.
TRY THE IDEA · NO TIMER · NO RANKING
You know the instruction. Now execute it.
Tap 3 twice, then tap 5 once. The 2 is a distractor: it is a count, not the first target.
0 / 3 actions registered
One browser click registers one action. This untimed exercise is separate from ranked runs and never changes your score or records.