This shit always makes me laugh. I'm not saying nuclear war isn't going to set us back tech-wise, but damn we aren't going to forget everything. This isn't Men in Black. We have books. Building a kiln and making pottery isn't hard. That's a few thousand year advancement on pine needle basket weaving. My bet is if the electricity goes down and 90+% of us are wiped out, it won't be more than a few years before small clusters of electricity are back online. Stop watching movies.