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A potato for a geoid

In mid-October 2021 an image of the geoid based on data from NASA’s GRACE satellite was posted on LinkedIn. It was an object lesson in the perils of attempting to disseminate science via a platform that restricts posts to 2500 characters and comments to 1250 characters.

Rose de Freycinet – artist?

Rose de Freycinet was certainly no artist, to judge from the only drawing possibly by her that is readily accessible, but she did have many other qualities and abilities, as revealed in her letters to her mother.

Railroad Rand (5: The miner)

Ayn Rand believed that all government was evil. So evil, in fact, that even borrowing money from it to buy a business was a sin that deserved a death sentence.

A very smart scientist

One milligal is approximately one millionth of the Earth’s gravity field, so it would seem that the periods of pendulums used for measuring gravity would have to be measured to a few millionths of a second for the results to be useful. This was simply not possible in the early nineteenth century, but pendulums were being used then to obtain results accurate to a few tens of milligal. How was it done?