5,518 reputation
11523
bio website vyznev.net
location Helsinki, Finland
age
visits member for 3 years, 11 months
seen Jun 29 at 20:14

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.


May
7
reviewed Approve Why don't the leaves of an electrometer repel each other in water?
May
7
revised How does light bend around my finger tip?
addendum 2
May
7
comment Could a hard drive actually have been erased as described in Cryptonomicon?
@BrandonEnright: I thought so too, at first, but I rather doubt it. The thing is, even an alternating magnetic field still attracts ferromagnetic materials, since the ferromagnet's polarity simply tracks the external field. At least, this holds up to the point where the frequency gets too high for the magnetic domains in the ferromagnet to follow, but at that point the field also becomes an inefficient degausser (since flipping the magnetization in the disks is what you want to do).
May
7
comment How does light bend around my finger tip?
@Navin: Probably an hour or two of actual work (mostly playing around with POV-Ray and Inkscape, and later with with my camera, plus writing). If you count the total elapsed time from "you know, I think I could answer this" to the "finished product" (whatever it'll be), though, it's so far three days and running. (I'm still planning to summarize the discussion about nearsightedness that was here before the comments were cleaned up by the mods.)
May
6
awarded  Great Answer
May
6
revised How does light bend around my finger tip?
got the photos swapped; thanks, Tim S.
May
5
revised How does light bend around my finger tip?
added 232 characters in body
May
5
revised How does light bend around my finger tip?
added 831 characters in body
May
5
awarded  Guru
May
5
awarded  Good Answer
May
5
awarded  Nice Answer
May
4
comment How does light bend around my finger tip?
@Virtlink: I just did.
May
4
answered How does light bend around my finger tip?
May
3
revised Could a hard drive actually have been erased as described in Cryptonomicon?
needs a tag
May
2
awarded  Nice Answer
May
1
answered Could a hard drive actually have been erased as described in Cryptonomicon?
May
1
comment Could a hard drive actually have been erased as described in Cryptonomicon?
If the field strength is indeed "half of typical MRI scanners", the effects would be interesting indeed. As in, any police walking through that door would've likely had their badges, guns, belt buckles and any other ferromagnetic metal objects they were carrying (not to mention the hard drives themselves) violently ripped off and slammed against the door frame. There's a reason why they make really sure you don't bring anything metallic close to an active MRI scanner.
Apr
25
comment Is there no radioactive decay between nuclear fusion and solid material formation?
Your confusion is due to a misunderstanding of how nuclear decay works. See How does a half-life work? for what's essentially the question you should've asked.
Apr
20
revised Birds sitting on electric wires: potential difference between the legs
copyedit
Apr
20
comment Birds sitting on electric wires: potential difference between the legs
Having the bird spread its legs will (very slightly) increase both the current and the voltage through the bird (as one would intuitively expect), not decrease them: increasing $R_{wire}$ increases both $I_{bird} = I_{wire} \dfrac{R_{wire}}{R_{bird}}$ and $V_{bird} = V_{wire}$.