An important thing to remember about science ficton is that the science involved is not always technology (though this is certainly the most common case).

The aforementioned Frankenstein, for example, could be considered to be an example where the science is medicine. Dr. Jekyll and Mr. Hyde could be one with psychology as the science. Even the Tarzan series qualifies, with the science being anthropology. The list could go on and on.

Just a quick note for those new to the genre or not particularly well-versed in it yet. Star Trek, Star of the Guardians, and the like are great, but there's so much more out there to be experienced.