mc ☕ @mc@qoto.org

@astromecanik
well sir, please accept my congratulations.
Clear skies to you.

@astromecanik
Is it your photo?

@publicvoit
Beautiful lesson. 👍

@publicvoit

>>> import math
>>> [x for x in range(2, 100) if all(x % y != 0 for y in range(2, int(math.sqrt(x)) + 1))]
[2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97]

@trinsec
You do? :D

I just found out that I've never watched this one.

Barbarella (film)
https://en.wikipedia.org/wiki/Barbarella_(film)

#film #movie #scifi #sciencefiction #janefonda #vadim #year1968

@mmu_man
A simpler explanation, by Sagan:

> It is known that Maxwell's electrodynamics - as usually understood at the present time - when applied to moving bodies, leads to asymmetries which do not appear to be inherent in the phenomena. Take, for example, the reciprocal electrodynamic action of a magnet and a conductor. The observable phenomenon here depends only on the relative motion of the conductor and the magnet, whereas the customary view draws a sharp distinction between the two cases in which either the one or the other of these bodies is in motion. For if the magnet is in motion and the conductor at rest, there arises in the neighbourhood of the magnet an electric field with a certain definite energy, producing a current at the places where parts of the conductor are situated. But if the magnet is stationary and the conductor in motion, no electric field arises in the neighbourhood of the magnet. In the conductor, however, we find an electromotive force, to which in itself there is no corresponding energy, but which gives rise - assuming equality of relative motion in the two cases discussed - to electric currents of the same path and intensity as those produced by the electric forces in the former case.

For Google,

#captcha #human

#darkmatter #coffee #milk #galaxy

So, it's settled.
We're back to the Cold War.

#thougths #deepthougts #coldwar

"The status of the teachers in the Hutchins curriculum had almost nothing to do with their #research ; perversely - unlike the American #university standard of today teachers were valued for their #teaching, their ability to inform and inspire the next generation."

- Carl Sagan, Demon Haunted World

@worldsendless
https://images-na.ssl-images-amazon.com/images/I/51USDFAor-L._SL1001_.jpg
😎

> LEDs provide what scientists call “broad white” light and there are concerns about the impact the unnatural lighting will have on ecosystems, including people and animals.

As Europe Goes To LEDs, Scientists Worry
https://hackaday.com/2022/09/19/as-europe-goes-to-leds-scientists-worry/

#led #unnatural #light #impact

> It’s a bit early to suggest that [Jay Bowles] of Plasma Channel has finally found the solution to this fundamental shortcoming of electrostatic propulsion, but his recently completed multi-stage ion thruster certainly represents something of a generational leap for the technology. By combining multiple pairs of electrodes and experimentally determining the optimal values for their spacing and operational voltage, he’s been able to achieve a sustained exhaust velocity of 2.3 meters per second.

Multi-Stage Ion Thruster Holds Exciting Promise
https://hackaday.com/2022/09/19/multi-stage-ion-thruster-holds-exciting-promise/

#ion #thruster #multistage

@Pat