I think the other poster meant "the reality of science" as in "the reality of day-to-day life" or "the reality of having diabetes" or "the reality of being married to an alcoholic." Ie. in that context, the word "reality" is taken to mean 'what it's like to ...' -- "what it's like to do scientific work" (it's hard, meticulous work), "what it's like to live the day-to-day life" (it's often filled with strife, surprises, etc.), "what it's like to have diabetes" (the person feels depleted of energy, has a number of health issuesetc.) etc. etc.