<oerjan> echo "Po\xc5\x82\xc4\x85\xc5\x84d is a European country. Its population consists of two main ethnicities, the North Po\xc5\x82es and the South Po\xc5\x82es." >wisdom/poland

#!/bin/sh
topic=$(echo "$1" | tr A-Z a-z)
[ -e "wisdom/$topic" ] || { echo "$1? ¯\(°_o)/¯"; exit 1; }
cat "wisdom/$topic"