Hypo is a reducing agent when combined with Na.
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Sodium Theosulfate AKA Hypo is one form of fixing agent
hypo
Sodium thiosulphate (sulphate contains 4 oxygen atoms, thio-sulphate has one of these replaced by a sulphur atom). Dissolves away unexposed silver salts from photographic film or paper.
It removes undeveloped silver halides from photographic emulsions. This leaves the silver behind, giving you a prnt that won't eventually turn black (because silver halides will eventually turn black on their own) or a negative light will pass through.
The epicenter is the origin of an earthquake. However, a hypocenter is the exact spot where a bomb has been dropped.