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Learn by Reading
Top-rated nonfiction book recommendation [History Books, Startup Books, Science Books]
since Jun 13, 2026 · HTTP 404
CohortClass of 2017What it is
Top-rated nonfiction book recommendation [History Books, Startup Books, Science Books]
HTTP liveness
13 probes since Jun 13Jun 13Jul 13
AliveHard-dead (404/5xx/parked)RedirectedUnverified (timeout/DNS/block)
Observed events
probes · press · GitHub- Jun 13, 2026First probe — downDead · 404
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Pulse Indexobserved activity
13 probes0 pressGitHub –Tranco –
Not enough observed signals for a Pulse Index (needs 2+ signal families).
Cohort survival · Class of 2017weekly
13,497 products launched in 2017 · 100% still active
13,462 active35 sunset
Still active
100%
Median lifespan
4.9y