Them: "Philosophy has no practical use." 

You, being a baller named Archimedes:
nostr:nevent1qqsr0n87a00qg57w60mhcxr5q05f832hyvfspvgl7vnn2qxvch2fsrgpzamhxue69uhhyetvv9ujuurjd9kkzmpwdejhgtczyrzc9tmcml6yyuqwck0zz7r9x2nswnqqh69hk84vnzdm7cnfsp5ucqcyqqqqqqg94tzj9 

 The hanging gardens of Babylon were serviced, thus.  

 Stoic philosophy is another practical one!