理科 = science
離れ = distancing from sth, independence of sth, disinterest in sth
理科離れ literally means keeping distance from science. This refers to a national issue where young people have a tendency not to choose study or career paths that are related to science.
Hmm... I don't know exactly when this problem arised nor to what degree. For more information you can read the ja.wikipedia.org entry of 理科離れ. It's in Japanese though.
It seems you used to share exquisitely rare novels, sometimes old, sometimes modern, in the form of epubs et al. Please... consider sharing them once more. The other uploaders concentrate mostly on pure erotica. I asterisked a few.