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Physics
Quick fact
A healthy young human can hear sounds from about 20 Hz (a low rumble) to 20,000 Hz (a high-pitched ring), but this range shrinks with age, typically losing the highest frequencies first.
Why this is interesting
Have you ever wondered why a dog whistle is silent to you but your pet responds instantly? The answer lies in the audio frequency range—the invisible boundary of what your ears can detect.
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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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