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The Powerhouse

The Powerhouse

Inside the invention of a battery to save the world [Books]

Education·Launched May 2015·0 upvotes·qz.com

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UNVERIFIEDlast checked Jul 16, 2026 · HTTP 403

CohortClass of 2015

What it is

Inside the invention of a battery to save the world [Books]

HTTP liveness

20 probes since Jun 16

Jun 16Jul 16

AliveHard-dead (404/5xx/parked)RedirectedUnverified (timeout/DNS/block)

Observed events

probes · press · GitHub

Jul 4, 2026
Probe inconclusive
Cloudflare block
Jun 16, 2026
First probe — live
Alive · 200 OK

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Tags

consumers pdf researchers

Pulse Indexobserved activity

182/4 signal families

Liveness40%

0.20

Press30%

no data

GitHub20%

no data

Tranco10%

0.97

Weighted observed activity · updated Jul 15

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