HN user
Also, "intense exercise" can cause you to gain muscle mass, which is denser than fat. So, if you have never worked out before and try to loose weight by working out a lot, you can actually gain more weight from muscle mass than what you loose from fat (and, so, your scale will move up even if you are loosing fat).
Relevant XKCD: http://xkcd.com/927/
Or you can also DIY with a lighter : https://www.youtube.com/watch?v=7foDiXX-CcE
Why couldn’t open source licenses be amended to forbid use in surveillance devices?
Because otherwise, it would be non-free.
If you look at the Free Software definition (from http://www.gnu.org/philosophy/free-sw.html ), the first freedom is : "The freedom to run the program, for any purpose (freedom 0).". "For any purpose" is really clear, you can't forbid someone to use it in a surveillance device.
The DFSG (Debian Free Software Guidelines, http://www.debian.org/social_contract#guidelines ) are even clearer : "No Discrimination Against Fields of Endeavor - The license must not restrict anyone from making use of the program in a specific field of endeavor. For example, it may not restrict the program from being used in a business, or from being used for genetic research.".
Also, Jon Skeet (specific to Stack Overflow) - http://meta.stackoverflow.com/questions/9134/jon-skeet-facts