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Systems, not slogans.
the shape of this subject
Biology is a systems discipline dressed as vocabulary. Brainback holds you to explaining function, not just naming parts.
Because biology rewards the students who do the reps — and punishes the ones who outsource them.
Add Biology as a Learn subject and every problem in these areas routes to the Socratic tutor — attempt-first, hint-laddered, output-guarded.
Attempt → correction → guiding question. No answer. Ever. Verbatim from a beta session.
The allele frequency increased in the population because heterozygotes had higher fitness…
What's the selection pressure here?
no answer · one guiding question · your next move
the anti-pattern
Answer machines make biology look like a solved problem. It isn't. The exam room reveals whose reasoning was built and whose was rented.
the recall card
Every wrong attempt and low-scored explain-back becomes a card. SM-2 schedules them — the tricky ones come back tomorrow, the solid ones drift out to next week, then next month.
Recall the core concept in your own words. Then apply it to a fresh example under 2 minutes.
Each has its own hint patterns and recall queue — because 'chemistry' isn't the same rep as 'organic chemistry.'
The subject where the shortcut has always been most expensive.
Limits, rates, and shapes of change — earned, not delivered.
Where symbolic manipulation becomes second nature — or doesn't.
See the diagram. Not just look at it.
Unit circle, but also unit intuition.
Vectors are directions, not numbers.
→biology — ready when you are
Attempt-first. Never the answer. Add it as a Learn subject in 30 seconds.