本圈子主要分享一些简单且有趣的数学题，用于娱乐目的以及放松头脑。
求下图中的角度。
There is no comment, let's add the first one.
Jupiter’s Great Red Spot (GRS), an easily visible anticyclonic vortex and the largest such vortex in the Solar System, has intrigued scientists since it was first observed through telescopes centuries ago. Recent research, including simulations and space mission data, has investigated its formation, stability, and the possibility of it shrinking or disappearing in the future. Credit: NASA, ESA, A. Simon (Goddard Space Flight Center), and M.H. Wong (University of California, Berkeley)Jupiter’s Gr ...
Illustration of the JUICE spacecraft at Jupiter. The Jupiter Icy Moons Explorer (Juice) equipped with the JANUS camera, recently conducted a flyby of the Moon and Earth to test the high-resolution capabilities designed to study Jupiter and its moons. Credit: ESAJANUS, a camera on the Jupiter Icy Moons Explorer, recently captured test images of the Moon and Earth as part of its mission to study Jupiter and its largest moons.Since ESA’s Jupiter Icy Moons Explorer (Juice) flew by the Moon and Earth ...
Researchers have found that genetics significantly influence coffee consumption, linking it to various health outcomes, including obesity and psychiatric conditions. The study highlights the complexity of genetic and environmental interactions in shaping coffee drinking habits and health impacts.When it comes to your genetics, the answer is complicated.Coffee drinking is a heritable habit, and one that carries a certain amount of genetic baggage.Caffeinated coffee is a psychoactive substance, no ...
Scientists at Scripps Research have discovered that in Caenorhabditis elegans, a molecule produced in the gut during fasting travels to the brain and blocks fat-burning signals. This finding, which sheds light on the communication between the gut and brain, suggests that fasting may have benefits beyond simple calorie restriction. The study highlights the potential for new treatments targeting metabolic diseases by mimicking gut hormone actions.Scientists at Scripps Research have identified a mo ...
1. What is contained in “Galois type” data?Gauss: The regular $n$-gon can be constructed by straightedge and compass if and only if $n = 2^{k}p_{1} . . . p_{r}$ where $p_{i} = 2^{2^{n_{i}}} + 1$ are Fermat primes. For example, $n = 17$. (Based on the study of the extension $\mathbb{Q}(\xi_{n})/\mathbb{Q}$ and cyclotomic polynomials). Here the key is that the hidden symmetries are in the Galois group action (not in the geometric symmetry). Later we will consider the “hidden” structures in the abs ...
Small details define us in many ways. For example, in some countries, it’s common to eat while watching TV while in other countries, eating requires a total state of awareness. And in countries like Greece or Turkey, it’s strictly forbidden to flush toilet paper. We hardly think about these things because we find them so common, but as it turns out, we might have been doing everyday tasks wrong all this time.Check out the rest of these common things Bright Side compiled for you that you might ha ...
When you finally get home after a busy day, nothing seems more appealing than taking a long hot shower and washing your stress away. But spending too much time in the shower might actually cause many skin problems you’ve been trying to avoid. As relaxing as it is, showering too often might do more harm than good for your skin.1. It may give you premature wrinkles.You’ve probably noticed that your fingers often get wrinkly after you’ve spent too much time in the shower. This happens because hot w ...
QuestionI write css to make li tags better.Everything is ok on laptop and my mobile phone(lenovo vibe 1) and asus zenfone 5But when Itested on Iphone 5 and Galaxy Note3 my color (rgb(240, 230, 140)) shown as red and black.I don't know what is wrong with my css. Should I use image istead of css or Is there a solution with css? Thanks.Here is my css:ul.anamenu li::before { content: "✔ "; color: rgb(240, 230, 140); font-size: 4vmin; text-indent: -2em;}Answer1Try to add font-family: 'Zapf Dingbats' ...
QuestionHow can I select count(*) from two different tables (call them tab1 and tab2) having as result:Count_1 Count_2 123 456I've tried this:select count(*) Count_1 from schema.tab1 union all select count(*) Count_2 from schema.tab2But all I have is:Count_1 123 456Answer1SELECT ( SELECT COUNT(*) FROM tab1 ) AS count1, ( SELECT COUNT(*) FROM tab2 ) AS count2 FROM dualCommentswhy do you need dual? what does that mean?It's a f ...
The universe undergoes expansion, and the rate of this expansion is characterized by the Hubble-Lemaitre constant. However, controversy surrounds the actual magnitude of this constant, as different measurement techniques yield conflicting values. This discrepancy, known as the “Hubble tension,” presents a perplexing challenge for cosmologists.The image shows the distribution of matter in space - (blue; the yellow dots represent individual galaxies). The Milky Way (green) lies in an area with lit ...
QuestionHow do I go about selecting COUNT(*)s from multiple tables in MySQL?Such as:SELECT COUNT(*) AS table1Count FROM table1 WHERE someCondition JOIN?? SELECT COUNT(*) AS table2Count FROM table2 WHERE someCondition CROSS JOIN? subqueries? SELECT COUNT(*) AS table3Count FROM table3 WHERE someConditionEdit:The goal is to return this:+-------------+-------------+-------------+ | table1Count | table2Count | table3Count | +-------------+-------------+-------------+ | 14 | 27 | 0 ...
QuestionThe query belows return 4 rows and it's good. But i need also to sum the results of all the counts in the same query. How to achieve it? I've tried different things but i get sintax errors.SELECT COUNT(*) FROM `schema1`.`table` WHERE STATE = 17 AND LEVEL = 1 UNION ALL SELECT COUNT(*) FROM `schema2`.`table` WHERE STATE = 17 AND LEVEL = 1 UNION ALL SELECT COUNT(*) FROM `schema3`.`table` WHERE STATE = 17 AND LEVEL = 1 UNION ALL SELECT COUNT(*) FROM `schema4`.`table` WHERE STATE = 17 AND LEV ...
