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The Quartet: Orchestrating the Second American Revolution, 1783-1789
Concise history of how the US Constitution came into being
last checked Jul 10, 2026 · Timeout
CohortClass of 2015What it is
Concise history of how the US Constitution came into being. [Books]
HTTP liveness
9 probes since Jun 16Jun 16Jul 10
AliveHard-dead (404/5xx/parked)RedirectedUnverified (timeout/DNS/block)
Observed events
probes · press · GitHub- Jul 4, 2026Probe inconclusiveTimeout
- Jun 17, 2026Back onlineAlive · 200 OK
- Jun 16, 2026First probe — unverifiedTimeout
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Pulse Indexobserved activity
9 probes0 pressGitHub –Tranco –
Not enough observed signals for a Pulse Index (needs 2+ signal families).
Cohort survival · Class of 2015weekly
12,940 products launched in 2015 · 100% still active
12,899 active41 sunset
Still active
100%
Median lifespan
4.9y