severákova polívka

asi zelňačka (mainly in czech)

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severak 12.2.2020 11:57:58

No One Can Explain Why Planes Stay in the Air

Do recent explanations solve the mysteries of aerodynamic lift?


severak 13.1.2020 09:58:31

Není to ostuda, ale odvaha. Nobelistka stáhla kvůli chybě vědecký článek - iDNES.cz

Držitelka Nobelovy ceny za biologii Frances Arnoldová stáhla jeden vědecký článek, u kterého je uvedena jako vedoucí autorka. Americká bioložka veřejně upozornila na chybu ve své práci a požádala o její stažení z prestižního časopisu. Jde o ukázku toho, jak bojovat s problémem zvaným replikační krize.


severak 9.1.2020 17:03:19

Why are some things darker when wet?

Have you ever wondered why some things become dark when you spill water on them? What’s exactly happening?  Well, let’s find out! SourceBefore I explain this phenomenon to...


severak 1.1.2020 12:48:40

This Insect Has The Only Mechanical Gears Ever Found in Nature

The small hopping insect Issus coleoptratus uses toothed gears on its joints to precisely synchronize the kicks of its hind legs as it jumps forward



severak 1.7.2019 10:35:46

Why plants don’t die from cancer

Humans and other mammals and birds would have been killed many times over by Chernobyl's radiation that plants in the most contaminated areas received. So why is plant life so resilient to radiation and nuclear disaster?


severak 21.6.2019 15:13:37

Jak pozorovat blesky v horních vrstvách atmosféry

Snímek ukazuje jednotlivé druhy TLE, jejich vzhled, barvu a výšku v atmosféře. Globální cirkulace


severak 20.6.2019 14:21:20

Connecting the dots: nitrogen dioxide over Siberian pipelines

New maps that use information from the Copernicus Sentinel-5P satellite reveal emissions of nitrogen dioxide along a Siberian natural gas pipeline that connects the Urengoy gas field – the second-largest gas field in the world – with Europe.


severak 28.5.2019 13:44:29

Henrietta Lacks

Henrietta Lacks (born Loretta Pleasant; August 1, 1920 – October 4, 1951) was an African-American woman whose cancer cells are the source of the HeLa cell line, the first immortalized cell line and one of the most important cell lines in medical research. An immortalized cell line reproduces indefinitely under specific conditions, and the HeLa cell line continues to be a source of invaluable medical data to the present day.Lacks was the unwitting source of these cells from a tumor biopsied during treatment for cervical cancer at Johns Hopkins Hospital in Baltimore, Maryland, U.S., in 1951. These cells were then cultured by George Otto Gey who created the cell line known as HeLa, which is still used for medical research. As was then the practice, no consent was obtained to culture her cells, nor were she or her family compensated for their extraction or use. Lacks grew up in rural Virginia. After giving birth to two of their children, she married her cousin David "Day" Lacks. In 1941 the young family moved to Turner Station, near Dundalk, Maryland, in Baltimore County, so Day could work in Bethlehem Steel at Sparrows Point...


severak 21.5.2019 13:33:05

Sci-Hub | | 10.1056/NEJMp1811491

Stroumsa, D., Roberts, E. F. S., Kinnear, H., & Harris, L. H. (2019). The Power and Limits of Classification — A 32-Year-Old Man with Abdominal Pain. New England Journal of Medicine, 380(20), 1885–1888. doi:10.1056/nejmp1811491


severak 11.4.2019 16:50:34

How Building a Black Hole for Interstellar Led to an Amazing Scientific Discovery

from https://www.wired.com/2014/10/astrophysics-interstellar-black-hole/


severak 22.3.2019 13:30:09

Příběh české vědecké stanice v Antarktidě: Slaví deset let

Jak vznikala polární stanice na ostrově Jamese Rosse? Výroční přednáška Pavla Proška bude 22. února.


severak 12.3.2019 10:19:20

Magnetic resonance imaging of male and female genitals during coitus and female sexual arousal

Objective: To find out whether taking images of the male and female genitals during coitus is feasible and to find out whether former and current ideas about the anatomy during sexual intercourse and during female sexual arousal are based on assumptions or on facts. Design: Observational study. Setting: University hospital in the Netherlands. Methods: Magnetic resonance imaging was used to study the female sexual response and the male and female genitals during coitus. Thirteen experiments were performed with eight couples and three single women. Results: The images obtained showed that during intercourse in the “missionary position” the penis has the shape of a boomerang and 1/3 of its length consists of the root of the penis. During female sexual arousal without intercourse the uterus was raised and the anterior vaginal wall lengthened. The size of the uterus did not increase during sexual arousal. Conclusion: Taking magnetic resonance images of the male and female genitals during coitus is feasible and contributes to understanding of anatomy.


severak 8.3.2019 15:24:38

Cloudy With a Chance of War - Issue 70: Variables - Nautilus

The burial detail, which had come for the corpses in the pigpen, was surprised. The “dead” were getting up and speaking English.…




severak 5.3.2019 10:30:09

What Causes the Smell of New & Old Books?

from https://www.compoundchem.com/2014/06/01/newoldbooksmell/


severak 5.3.2019 10:08:38

Ať se píše kterýkoli rok, od jaderné fúze nás dělí vždy týchž dvacet let. Už od roku 1950

Minulý týden, několik dnů před svými třináctými narozeninami, dokončil Jackson Oswalt z Memphisu v Tennessee stavbu zařízení, v němž probíhá jaderná fúze. Jádra atomů deuteria se tam slučují, mění se na helium a uvolňují energii.


severak 19.2.2019 22:09:10

No, 'Oumuamua is not an alien spaceship. It might be even weirder.

Not to put too fine a point on it, but what the frak is 'Oumuamua?



severak 4.1.2019 09:15:42

Snakes and Ladders can be analyzed by converting it to a Markov Chain

from https://boingboing.net/2018/01/03/the-big-snake.html


severak 17.12.2018 09:39:33

Two Stalagmites Found in Chinese Cave Are a 'Holy Grail' for Accurate Radiocarbon Dating

Since its inception in the 1950s, radiocarbon dating has proven indispensable to archaeologists and climate scientists, who rely on the technique to accurately date organic compounds. But a good thing just got better, owing to the discovery of two stalagmites in a Chinese cave containing a seamless chronological atmospheric record dating back to the last Ice Age.





severak 20.9.2018 12:33:38

The size of things: an ngram experiment

Investigating the changing popularity of size analogies in English books. Why was "the size of a pigeon's egg" a common phrase until the late 1800s?


severak 26.7.2018 16:21:00

The Art of Filming a CRT TV Screen on your Camera or Phone for Retro Gaming | MVG

from https://www.youtube.com/watch?v=cISY-7gEFms


severak 13.7.2018 09:13:48

Proč auto „kvílí“ při jízdě na zpátečku? - Garáž.cz

Jedná se o zvuk po desetiletí provázející většinu vyrobených automobilů. Když zařadíte zpátečku a rozjedete se, začne se z převodovky ozývat „kňučení“. Drtivá většina má tento zvuk zažitý jako normální jev, ale jen málokdo ví, proč vlastně auta při jízdě dozadu takhle kňourá. Co se tedy skrývá za odvěkou záhadou?



severak 4.3.2018 21:42:31

The British amateur who debunked the mathematics of happiness

The astonishing story of Nick Brown, the British man who began a part-time psychology course in his 50s – and ended up taking on America's academic establishment


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