Fascinating stuff on the different ways organisms distribute oxygen around their bodies. While vertebrates mostly stick with hemoglobin, the rest of the animal kingdom have numerous other ways.

quantamagazine.org/icefish-stu

Spiral Aurora over Icelandic Divide

Image Credit & Copyright: Juan Carlos Casado (TWAN, StarryEarth)

apod.nasa.gov/apod/ap190421.ht #APoD

Interesting. For a non-rotating black hole, the singularity at its centre is a point. But for a rotating black hole, the situation is more complicated. An article by Ethan Siegel on what the mathematical solution for a rotating black hole tells us about how such black holes behave.

forbes.com/sites/startswithaba

M31, the closest large galaxy that looks like our Galaxy, covers a large part of the sky (this frame is about 6 full moons on a side). From a reasonably dark site M31 is visible to the unaided eye. (image taken with the Rothney Astrophysical Observatory 0.5m Baker-Nunn telescope). #astrophoto

Joe Armstrong, the author of the language, Erlang, has died. I have never used Erlang, but this thread on Hacker News about him shows him to be a really nice person.

news.ycombinator.com/item?id=1

"Memories of disaster fade fast". Which might explain why people keep moving back to flood prone areas, and possibly why people are hesitant about vaccines or sympathetic to extreme right-wing movements.

economist.com/science-and-tech

M51 is a spiral galaxy located about 25 Mly from Earth. It is interacting with a smaller nearby galaxy. Such interactions often cause a flurry of star formation. #astrophoto

Book Review: Xiao Xiao and the Dragon Pearl by Joyce Chng.

A young adult novel with princesses, dragons, swords, assassins and set in Manchuria during the Qing dynasty period.

Guest reviewed by @Soulsubsistence.

libreture.com/blog/book-review

Interesting. Software Heritage archives source code for various projects, including from GNU Guix.

For Guix, "Guix can fall back to the Software Heritage archive whenever it fails to download source code from its original location."

softwareheritage.org/2019/04/1

Via Hacker News [ news.ycombinator.com/item?id=1 ].

While walking along the river at Springleaf Nature Park, Singapore, I saw a spot of bright red in the water. Getting closer, I saw it was this Red Water Lily (Nymphaea rubra) in full bloom. Spotted on 19 April, 2019.

On iNaturalist [ inaturalist.org/observations/2 ].

A look at a forgotten building in the busy business district of Singapore. It's a former hospital that houses Singapore's oldest lift and may be the earliest example of Modernist architecture in Singapore.

channelnewsasia.com/news/cnain

The Register has the perfect headline and article for the Mueller Report: "We've read the Mueller report. Here's what you need to know: ██ ██ ███ ███████ █████ ███ ██ █████ ████████ █████"

:-)

theregister.co.uk/2019/04/18/m

Lemmy: "a federated alternative to reddit in rust"

Currently in Beta. Might keep an eye on this

github.com/dessalines/lemmy

Via Hacker News [ news.ycombinator.com/item?id=1 ]

For millions of years, mammals lived in the shadows of the non-avian dinosaurs. That has had an effect on how our eyes work (and don't work). Interesting article on the evolution of the eyes of mammals.

nature.com/articles/d41586-019

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