If you take a more Darwinian point of view the dynamics of the universe are such that as the universe evolved in time, complex systems arose out of the natural dynamics of the universe. ↗
Limit use of shareware and public domain software to systems without fixed disks. If you do use them on fixed disks, allocate separate subdirectories... Public domain or shareware software should never be placed in the root directory. ↗
Other countries, such as Israel, successfully employ behavior detection techniques at their airports, but the bloated, ineffective bureaucracy of TSA has produced another security failure for U.S. transportation systems. ↗