Today I Learned

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We learn something new every day. This is a community dedicated to informing each other and helping to spread knowledge.

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submitted 11 months ago* (last edited 10 months ago) by [email protected] to c/[email protected]

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Back in school I heard the story that Haydn wrote the "Surprise Symphony" because he was sick of people sleeping through his music, and wanted to startle them awake. It seems like this was a myth.

From the Wikipedia article:

In Haydn's old age, his biographer Georg August Griesinger asked him whether he wrote this "surprise" to awaken the audience. Haydn replied:

No, but I was interested in surprising the public with something new...

Why do all the cool stories from history end up being made up?


From Wikipedia: In 1958, while he was an airman first class, his commanding officer recommended him for an early honorable discharge. "In summary, this airman, although talented, will not be guided by policy," chief of information services Colonel William S. Evans wrote to the Eglin personnel office. "Sometimes his rebel and superior attitude seems to rub off on other airmen staff members."


Link to the site

The map contains exact locations of homocides from the 2000s to now. You can zoom in far enough to see the neighborhood the murder(s) happened in. I'm sorry that the site is primarily in Norwegian, but you should still be able to zoom around. Wonder of there's a global map that's that detailed.


Neural networks have become increasingly impressive in recent years, but there's a big catch: we don't really know what they are doing. We give them data and ways to get feedback, and somehow, they learn all kinds of tasks. It would be really useful, especially for safety purposes, to understand what they have learned and how they work after they've been trained. The ultimate goal is not only to understand in broad strokes what they're doing but to precisely reverse engineer the algorithms encoded in their parameters. This is the ambitious goal of mechanistic interpretability. As an introduction to this field, we show how researchers have been able to partly reverse-engineer how InceptionV1, a convolutional neural network, recognizes images.



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submitted 2 weeks ago* (last edited 2 weeks ago) by [email protected] to c/[email protected]

I first heard about it as being used to mark gauges on a 1770s submersible so the operator could read them in the dark.

Unfortunately the wiki isn't built out much.

submitted 2 weeks ago* (last edited 2 weeks ago) by [email protected] to c/[email protected]

Idk how many other games you can do this with but I thought it was interesting.


The EFF soon created a crossword, overlaid it on top of the monkey, and featured it on their website.

August 2014 – Photographer David Slater sent a copyright takedown notice to the Wikimedia Commons over a photograph of a Celebes crested macaque taken on one of his cameras, which at the time was being operated by the macaque, resulting in a "monkey selfie". The Wikimedia Foundation dismissed the claims, asserting that the photograph, having been taken by a non-human animal, rather than Slater, is in the public domain per United States law.[277][278] Subsequently, a court in San Francisco ruled copyright protection could not be applied to the monkey and a University of Michigan law professor said "the original monkey selfie is in the public domain."[279] :

In September 2015, PETA filed a lawsuit against Slater and Blurb, requesting that the copyright be assigned to the macaque and that PETA be appointed to administer proceeds from the photos for the endangered species' benefit.[6] In dismissing PETA's case, a federal district court ruled that a monkey cannot own copyright under US law.[7] PETA appealed.

In May 2018, Condé Nast Entertainment acquired the rights from Slater to make a documentary film related to the monkey selfie dispute. The project was being overseen by Dawn Ostroff and Jeremy Steckler.[55]


The weight of the trees was so great that the ones on the bottom got squished and became coal. That’s where coal is from. Bonus fact: the whole time this was happening, sharks were hunting in the oceans. Sharks are older than trees and fungus!

submitted 3 weeks ago* (last edited 3 weeks ago) by [email protected] to c/[email protected]

Some cephalopods are able to fly through the air for distances of up to 50 metres (160 ft). While cephalopods are not particularly aerodynamic, they achieve these impressive ranges by jet-propulsion; water continues to be expelled from the funnel while the organism is in the air. The animals spread their fins and tentacles to form wings and actively control lift force with body posture. One species, Todarodes pacificus, has been observed spreading tentacles in a flat fan shape with a mucus film between the individual tentacles, while another, Sepioteuthis sepioidea, has been observed putting the tentacles in a circular arrangement.


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