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).
> 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.".
