heuristicus

A de Sitter universe is one where there is no matter or radiation, only a cosmological constant.

create particles which are affected by nothing but each others' gravity, and then let the particles move.

give particles an initial velocity, and then run the system.

Could be a nice little toy which does some quite cool stuff. Also might be a nice exercise in optimisation, since it will probably be crazily inefficient to calculate the mutual gravity of all the particles in the system once you go beyond a relatively small number.

See RRC's comment in http://www.reddit.com/r/askscience/comments/jsmwy/why_do_objects_in_space_orbit_in_the_same_plane/

heuristicus

Program that takes n folders/files and m devices with storage capacity and decides the best way to distribute files among them to best fill the given devices.

How best to fill devices is debatable, but let's assume that you want to use as much space on each device as possible.

Program would try and keep folders together - option to ignore folder structure and maximise the amount of fill?

Could move each stack into a separate folder to indicate the device it should go on to, if the user does not/cannot plug in all devices.

Method: