TIL about anti ninja floors in Japan. They were purposefully made to squeak as to alert people of intruders. science.howstuffworks.com Submitted by tpb01 t3_yf8hvz on October 28, 2022 at 12:32 AM in todayilearned 187 comments 5,566
Monochrome_Fox_ t1_iu3lx91 wrote on October 28, 2022 at 8:58 AM I knew it! I knew there were ninjas here! Permalink 1
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