c84c20197a0ed5f3e35d1c08348b346f8f08d1971e4c6165a40a09e9c0d70339  ai-history.tdf
102f972fdfb30bac7da73725b4f21fe40cfe7893f2075f2ff1427deaaf558762  apollo-program.tdf
6a6628aa0705f4fabd7cb4095d904add204935ec24deab79a9044045f05a9c28  climate-evidence.tdf
5adda72b7a8941738b13279ad2df3f17219319c31719a4285286b39ae66100fe  human-genome.tdf
991fc66d588014a575fb8ac52e24c7c9a02a8d9e5ae24f70238ac9ffc33e06df  personal-computer-1984.tdf
7689ce26efd9b557ccb24cdcca39b2557ac45d84be74b3d7bb0fce68b54926c1  unix-history.tdf