Advanced Aerospace Threat Identification Program (Wikipedia)

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The Advanced Aerospace Threat Identification Program (AATIP) was an unclassified but unpublicized investigatory effort funded by the United States Government to study unidentified flying objects (UFOs) or unexplained aerial phenomena (UAP). The program was first made public on December 16, 2017. The program began in 2007, with funding of $22 million over the five years until the available appropriations were ended in 2012. The program began in the U.S. Defense Intelligence Agency.

The floating homes of Lake Titicaca (bbc.com) Created by the indigenous Uros people as protection against attacks from the Incas, the Uros Islands are one of the world’s most innovative feats of human engineering.