8.28.2 Greatest hits from previous weeks

8.28.2.1 Find eigen energies of time-independent Schrödinger equation
8.28.2.2 Assign the results from a Solve to variable(s)
8.28.2.3 How to create animated snowfall?
8.28.2.4 How can I draw the Olympic rings with Mathematica?
8.28.2.5 How to calculate contour integrals with Mathematica?
8.28.2.6 How to add a front-end to the free Wolfram Engine?
8.28.2.7 How to create a new "person curve"?
8.28.2.1 Find eigen energies of time-independent Schrödinger equation

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=32293

I'm trying to get the eigenvalues of a one dimensional time-independent Schrödinger equation, 
 
$-\frac{h^2}{2m_0}\frac{d^2\psi}{dx^2}+U(x)~\psi=Ei~\psi$ 
 
where U(x) is some potential and Ei is the ... 
[equation-solving] [physics] [parametric-functions]
 
asked by xslittlegrass https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=1364 Score of 50
answered by Jens https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=245 Score of 46
8.28.2.2 Assign the results from a Solve to variable(s)

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=6669

I understand Mathematica can't assign the results of a Solve to the unknowns because there may be more than 1 solution. How can I assign the 4 values of following result to variables? 
... 
[equation-solving] [assignment] [faq]
 
asked by stevenvh https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=1450 Score of 59
answered by Artes https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=184 Score of 36
8.28.2.3 How to create animated snowfall?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=16881

Well, the title is self-explanatory. What sorts of snowfall can we generate using Mathematica? There are two options I suggest to consider: 
 
1) Continuous GIF animations with smallest possible number ... 
[dynamic] [random] [animation] [generative-art]
 
asked by faleichik https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=219 Score of 41
8.28.2.4 How can I draw the Olympic rings with Mathematica?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=8885

How can I draw the 5 interlocking Olympic rings with Mathematica? 
(SVG version) 
Edit 
 
Hard choice, but some pretty cool answers here. I didn't have 3D answers in mind when I posted the question, but ... 
[graphics] [generative-art]
 
asked by Mike Honeychurch https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=77 Score of 46
answered by cormullion https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=61 Score of 23
8.28.2.5 How to calculate contour integrals with Mathematica?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=34073

How to calculate the integral of $\frac{1}{\sqrt{4 z^2 + 4 z + 3}}$ over the unit circle counterclockwise for each branch of the integrand? 
[calculus-and-analysis] [complex]
 
asked by user64494 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=7152 Score of 43
answered by Artes https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=184 Score of 67
8.28.2.6 How to add a front-end to the free Wolfram Engine?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=198839

https://blog.stephenwolfram.com/2019/05/launching-today-free-wolfram-engine-for-developers/ 
 
http://www.wolfram.com/engine/ 
 
The Free Wolfram Engine for Developers is available for pre-production ... 
[front-end] [free-wolfram-engine] [jupyter-notebook]
 
asked by Alexey Golyshev https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=23402 Score of 76
answered by Alexey Golyshev https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=23402 Score of 64
8.28.2.7 How to create a new "person curve"?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=17704

Wolfram|Alpha has a whole collectionź of parametric curves that create images of famous people. To see them, enter  WolframAlpha["person curve"]  into a Mathematica ... 
[graphics] [image-processing] [algorithm] [wolfram-alpha-queries] [generative-art]
 
asked by Simon https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=34 Score of 88
answered by Vitaliy Kaurov https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=13 Score of 48