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Philosophy
Quick fact
Hempel introduced this paradox in 1945; it is also known as the 'raven paradox' and reveals a fundamental tension between two natural principles of confirmation.
Why this is interesting
You see a black raven and think, 'That confirms that all ravens are black.' But what if seeing a white shoe also confirms it? That seems absurd—yet logic says it does. How can that be?
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Subjects · study & training · careers
Choose something you are considering. FACTREE will give you a clear picture of what it contains, how its main parts connect and where it could lead.
This private catalogue connects 31 subjects, study routes and careers across six broad areas. Public Maps and learner routes remain off.
Browse subjects
Open a subject to see its complete shape at a glance. You can always return here and choose something else.
See what programming involves, how its main areas connect, and whether you find the knowledge interesting enough to take it further.
Structuring the Programming Map…
Complete subject map
Move from the one-screen overview into all 19 areas. Open any area, compare possible Paths and return to the overview whenever you want.
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Curiosity quiz
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Administrator
Review learner demand, card visibility and private knowledge-architecture evidence.
Knowledge architecture
This background view organises existing cards. It is separate from the authored lessons above.
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Curriculum coverage
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