10.39.2 Greatest hits from previous weeks

10.39.2.1 Why I get the "Set::write: "Tag Times in is Protected." error?
10.39.2.2 Conversion of Sine to Cosine
10.39.2.3 Drawing a square root spiral
10.39.2.4 Mathematica Minecraft
10.39.2.5 Mathematica 10.0.x freezes in Initializing kernels
10.39.2.6 xkcd-style Plots
10.39.2.7 How to graph a sphere with cartesian equations?
10.39.2.1 Why I get the "Set::write: "Tag Times in is Protected." error?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=11868

Why I get the error below with this code: 
 
... 
[vector-calculus]
 
asked by Aurelius https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=1669 Score of 11
answered by Mark McClure https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=36 Score of 15
10.39.2.2 Conversion of Sine to Cosine

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=67521

I'm solving equations with many Cosines and Sines. 
And I want to convert all the Sines to Cosines using trigonometric formulas such as cos(x)=sin(x+pi/2). 
How can I do this? 
[trigonometry] [conversion]
 
asked by YongCheol Kwon https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=23041 Score of 6
answered by Sjoerd C. de Vries https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=57 Score of 2
10.39.2.3 Drawing a square root spiral

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=66969

Here is a start. I'm looking for a nice way to draw it. 
 
... 
[graphics] [geometry]
 
asked by matrix42 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=5379 Score of 26
answered by Bob Hanlon https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=9362 Score of 25
10.39.2.4 Mathematica Minecraft

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=19669

Some time ago I asked myself: with all these great graphics and interactive capabilities of Mathematica, what kinds of 3D games can be implemented in it?  And the answer which came to mind is ... 
[programming] [dynamic] [graphics3d] [eventhandler] [development]
 
asked by faleichik https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=219 Score of 173
answered by faleichik https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=219 Score of 255
10.39.2.5 Mathematica 10.0.x freezes in Initializing kernels

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=92931

Bug caused by paclet update and fixed by paclet update. 
I updated to Windows 10 and have been running Mathematica fine on it for over a month.  For some reason, it has just stopped working. I don't ... 
[bugs] [front-end] [system] [kernel-startup] [paclets]
 
asked by mitcheljh https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=6783 Score of 80
answered by ilian https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=145 Score of 100
10.39.2.6 xkcd-style Plots

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=11350

I received an email to which I wanted to respond with a xkcd-style graph, but I couldn't manage it. Everything I drew looked perfect, and I don't have enough command over ... 
[plotting] [generative-art]
 
asked by Amatya https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=2039 Score of 644
answered by Simon Woods https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=862 Score of 508
10.39.2.7 How to graph a sphere with cartesian equations?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=24169

I'm new to Mathematica and I need to ask how to graph a sphere, cylinder, etc.. using cartesian equations. 
 
For example in sphere's case $x^2+y^2+z^2=1$ 
 
I tried to use ... 
[plotting]
 
asked by German https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=7145 Score of 9
answered by Dr. belisarius https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=193 Score of 15