Natality, Pearl Harbor, and the New York City blackout.
D001723:Birth Rate; D004190:Disasters; D005260:Female; D006254:Hawaii; D006801:Humans; D008297:Male; D009519:New York City; D011247:Pregnancy; D012189:Retrospective Studies; D012725:Sexual Behavior; D013223:Statistics as Topic; D013997:Time Factors; D014857:Warfare