/u/SittingRedhorse's posts in /r/todayilearned

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TIL that Magnesium helped advance photojournalism. The first photography flash, a powder mix of Mg & potassium, created bright light when ignited. Jacob Riis was an early adopter and used it to document life in the often dark NYC's tenements. His work sparked public outcry, and then housing reforms

199 upvotes

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TIL that the French had for the best part of 5 centuries a very lucrative salt tax. So much so that at some point it was as valuable to France, as the American silver mines were to Spain (according to Cardinal Richelieu)

128 upvotes

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TIL that constipation often comes down to a muscular movement change. Potassium deficiency (among other reasons) can cause the digestive system’s muscle contractions (peristalsis) to slowdown, food doesn’t progress along as usual and then…constipation.

10 upvotes

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Magnesium helped advance photojournalism. The first photography flash, a powder mix of Mg & potassium, created bright light when ignited. Jacob Riis was an early adopter and used it to document life in the often dark NYC's tenements. His work parked public outcry, and then housing reforms

1 upvotes

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Magnesium helped advance photojournalism. The first photography flash, a powder mix of Mg & potassium, created bright light when ignited. Jacob Riis was an early adopter and used it to document life in the often dark NYC's tenements. His work parked public outcry, and then housing reforms

1 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
TIL that Magnesium helped advance photojournalism. The first photography flash, a powder mix of Mg & potassium, created bright light when ignited. Jacob Riis was an early adopter and used it to document life in the often dark NYC's tenements. His work sparked public outcry, and then housing reforms	199
TIL that the French had for the best part of 5 centuries a very lucrative salt tax. So much so that at some point it was as valuable to France, as the American silver mines were to Spain (according to Cardinal Richelieu)	128
TIL that constipation often comes down to a muscular movement change. Potassium deficiency (among other reasons) can cause the digestive system’s muscle contractions (peristalsis) to slowdown, food doesn’t progress along as usual and then…constipation.	10
Magnesium helped advance photojournalism. The first photography flash, a powder mix of Mg & potassium, created bright light when ignited. Jacob Riis was an early adopter and used it to document life in the often dark NYC's tenements. His work parked public outcry, and then housing reforms	1
Magnesium helped advance photojournalism. The first photography flash, a powder mix of Mg & potassium, created bright light when ignited. Jacob Riis was an early adopter and used it to document life in the often dark NYC's tenements. His work parked public outcry, and then housing reforms	1