I watched 3 minute and realized he would love it and sent it on. Thank you!Amazing video for those that like numbers, codes, and puzzles. From the best documentary You-Tuber out there. @Rhuarc , you should send this to your brother. :)
I thought the entire video was fascinating. Definitely worth a watch during free time. Try to get your students to crack K4!I watched 3 minute and realized he would love it and sent it on. Thank you!