Thales’ circles

“All is water”

170 notes

jtotheizzoe:

Happy Earth Day! Here is a new time-lapse of images from the International Space Station, titled The World Outside My Window. You may not be looking at it from this perspective, but you’ve got a world outside your window, too. Take care of it.

Turn up your speakers, go full screen, and lean back. Heck … this one even goes to 4K. Enjoy.

(video by David Peterson)

Filed under Earth day ISS video

178 notes

curiosamathematica:

Pi in its full glory, popping up in all kinds of formulas.Which one do you find the most beautiful or intriguing?

I like its appearance in the values of various integral-defined functions: Gamma(1/2), the integral of exp(-x^2) over R (which is related to the error function), and the integral of sin(x)/x over R (which is the limit of the sine integral Si(x), and I didn’t know before today!). 

curiosamathematica:

Pi in its full glory, popping up in all kinds of formulas.
Which one do you find the most beautiful or intriguing?

I like its appearance in the values of various integral-defined functions: Gamma(1/2), the integral of exp(-x^2) over R (which is related to the error function), and the integral of sin(x)/x over R (which is the limit of the sine integral Si(x), and I didn’t know before today!). 

(via beautyandthemaths)

Filed under pi math integrals

5 notes

“‘We Have Always Fought’: Challenging the ‘Women, Cattle and Slaves’ Narrative” by Kameron Hurley — A Dribble of Ink

Filed under women feminism history stories

1 note

A properly, conformally embedded once-punctured torus in R^3, parametrized by 

1/(1-sin(u)sin(v))*(cos(u)cos(v),cos(u)sin(v),sin(u)sin(v))

with 1≤u≤2π, 1≤v≤2π, obvs.

(A surface in R^3 is properly embedded if its intersection with any compact set is compact. Thus, the puncture in this surface is placed “at infinity”. A surface is conformally embedded if angles in the intrinsic metric match angles in the ambient metric. Here, you can see that latitude and longitude lines on the torus meet orthogonally.)

Filed under math torus

1 note

Making Light: Victory to the People

Those who love sausage and the scriptures shouldn’t watch either of them being made.

How shall I begin this?

There are three topics that one is not supposed to talk about in the wardroom: sex, politics, and religion. We’ve had recent threads about both sex and politics, so it’s time for religion. To that end, here we go.

Way back when, there was a popular show called Jesus of Nazareth. Unfortunately it was canceled by the network after just three seasons, leaving behind a small but very devoted fandom. The fandom spread. Some of the fans told and retold all the episodes of the show that they had seen. Others copied out samizdat versions of the tie-in novels. Yet others wrote original fanfic.”

Filed under Bible canon fanfic apocrypha Constantine Eusebius of Caesarea Athanasius Nicea Marcion Polycarp Tertullian culture

177,512 notes

passivemanipulations:

Project for my Social Psych class last semester. This poster series was created to 1) challenge these internalized stereotypes by bringing them to the viewer’s attention and 2) expand the range of role models by including a diverse group of women. Each poster follows the same basic pattern: a woman who has demonstrated her competency in a particular area refutes the stereotype that appears above her in the form of “Girls can’t …”. While the posters target girls ranging from children to young adults, I expect the message would also cause people outside that demographic to question their own beliefs about women and power.  I designed each aspect of the posters with several principles of social psychology in mind:

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(via wasarahbi)

Filed under feminism