There are only 7 types of existential problems. We call these problems Pj Problems (Where j = 1, 2, 3, 4, 5, 6, 7). P1 = containership, P2 = identity,
P3 = force, P4 = motion, P5 = change, P6 = grouping/interaction,
P7 = equilibrium. The variations of a particular Pj Problem, we call its Alleles (Ajk).
A space of interest (Si) with the problem of interest (PjAjk) stringed to it, is a PjProblemString (SiPjAjk)
PjProblemStrings are everywhere. Their totality is
the Problem Genome.
Water strings, land strings, air strings and celestial strings are the PjProblemStrings associated with the tools humans use in these spaces. Human Strings is a special group that consists of the PjProblemStrings associated with human health.