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The Hunt for Vulcan: And How Albert Einstein Destroyed a Planet, Discovered Relativity and Deciphered the Universe

Thomas Levenson

Recommended by 1 person on the record.

The bar next to each date shows how long ago it was said: 6d is days, 4yr is years.

Cosma Rohilla Shalizi liked it affiliate
A short, but engaging and wide-ranging, history of how scientists became willing to hypothesize a planet inside the orbit of Mercury, thought they had found it, and ultimately gave up on it, because the idea that the mere presence of distorts space and time was a much more reasonable explanation of tiny anomalies in delicate, recondite observations.

on bactra.org · 31 Oct 2016

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That little bar

It says how long ago something was said, so you can tell last month from 2014 without doing the arithmetic. Full and green is recent; it drains and cools as the date gets older, and empties completely at about 6 years.

A striped bar means the date itself is an estimate — the source did not carry an exact one. An entry with no date at all gets no bar.