Included: a paperclip trick; whale artist John Perry;[11] fishing with a kite; a house of jigsaw puzzles; torture tests for household appliances (UL (safety organization)); military experts setting off a large conventional explosion (Trinity (nuclear test)); hunting for spider webs; Fillmore fish hatchery; salmon struggling to reach their spawning ground; the top-secret preparations for the D-day invasion; books made of wood pulp.