A 35mm or medium format DSLR with lenses from 28mm to 200mm for studio work and up to 400mm for location. Strobe lighting and light modifiers i.e. softboxes, reflectors, honeycombs, snoots, gels etc...
Lighting, composition. Getting people comfortable if you're a portrait photographer. Although this might depend on the look/emotion you're trying to get from your subject.
The most important aspect of colored photography was the cure for the Polio virus. In order for scientists to distinguish the difference between cells in a sample, they needed to use high resolution...
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