Betz Mystery
Links:
https://wonderfulengineering.com/betz-sphere-makes-place-inexplicable-wonders/
https://www.popularmechanics.com/science/a35092347/betz-mystery-sphere-conspiracy-theory/
https://join.popularmechanics.com/pubs/HR/POP/POP1_Plans.jsp?cds_page_id=250088&cds_mag_code=POP&cds_tracking_code=edit-inline-betz-sphere-conspiracy