5,780 reputation
11624
bio website vyznev.net
location Helsinki, Finland
age 35
visits member for 4 years, 1 month
seen 10 hours ago

I'm a PhD student in biomathematics, working on stochastic individual-based models of evolution in spatially structured populations. My other interests include cryptography, programming games and puzzles, photography and graphic design.


I'm the main author and maintainer of the Stack Overflow Unofficial Patch (SOUP), a user script for browsers with GreaseMonkey-compatible user script support (Firefox, Chrome, Opera, possibly Safari) that fixes or works around a number of outstanding issues with the Stack Exchange user interface.

I tend to answer a lot more questions than I ask. Some answers I'm rather proud of:

CC-Zero Please consider any (original) code I post to Stack Overflow and other Stack Exchange sites to be released under CC-Zero unless stated otherwise. You may do whatever you want with it and don't have to credit me in any way, although of course that would be nice.


Aug
17
revised How to make the projected image smaller by adding one ore more lenses in front of the built in projector lense?
reupload image from imageshack to stack.imgur before it gets replaced by ads; see http://meta.stackexchange.com/q/263771
Aug
17
comment What does it mean if a = g in this situation?
Alas, it looks like ImageShack has deleted your image, and replaced it with an ad banner. If you can, please reupload the image (or something equivalent) using the image upload button in the editor toolbar (which will upload it to Stack Exchange's imgur account).
Aug
17
revised Why does air contain $Ar$ specifically?
remove broken ImageShack image
Aug
17
revised $t\bar{t}$ asymmetry
reupload image from imageshack to stack.imgur before it gets replaced by ads; see http://meta.stackexchange.com/q/263771
Aug
17
revised ATLAS and CMS calorimeters
reupload image from imageshack to stack.imgur before it gets replaced by ads; see http://meta.stackexchange.com/q/263771
Aug
17
revised Is there a way to fill Tank 2 from Tank 1 through Gravity alone?
reupload image from imageshack to stack.imgur before it gets replaced by ads; see http://meta.stackexchange.com/q/263771
Aug
13
comment Can a Skydiver Land On a Large Slide and Survive?
See also: ski jumping.
Aug
2
comment What is the smallest distance possible between two stars?
en.wikipedia.org/wiki/Contact_binary
Jul
30
comment Conical train wheels
Also, I'm pretty sure the center-of-mass argument is backwards. It really doesn't matter whether the CoM moves left or right; what matters for stability is whether it moves up or down, and that's not so obvious from the geometry. (In particular, it depends on the curvature of the wheel surfaces, not just on their slope.) But, of course, the wheel radius effect described by @Kyle probably dominates this anyway.
Jul
23
awarded  Yearling
Jul
15
awarded  Nice Answer
Jul
14
revised Why are expressions such as $\operatorname{ln}T$ used in thermodynamics where $T$ is not dimensionless?
copy comments into answer
Jul
12
answered Why does medium not affect the frequency of sound?
May
13
answered What will happen if a ball of ice with the mass of sun is thrown into the sun?
Apr
29
comment Does a truck stop faster if the stack on the back of truck is stable or if it moves forward?
Short answer: If the stack slides, the truck will stop faster, but the stack will stop slower. Depending on what the stack consist of, that may or may not be desirable.
Apr
24
comment Paradox in applying Newton's second law
Why the hidden spoilers?
Apr
1
revised Does the microgravity environment in highly elliptical orbits differ from circular orbits?
added 825 characters in body
Apr
1
answered Does the microgravity environment in highly elliptical orbits differ from circular orbits?
Apr
1
comment Why doesn't light affect a compass?
Technically, light does cause (bits of) the needle (mostly, the electrons) to wiggle at around 400-800 THz, which is why we can see it in the first place. If it didn't interact with visible light at all, it would be totally transparent.
Mar
2
comment Why doesn't a cigarette lighter generate thrust?
The combustion will also generate some minimal thrust, since it will heat the gas, causing it to expand, and some of that expanding gas will push against the lighter. Still, the combustion geometry is very poor (and the amount of fuel minimal anyway), so you won't get much thrust out of it.