Editorial: Era of progress.
D000397:Air Pollution; D000818:Animals; D002648:Child; D004534:Egypt; D004739:England; D005260:Female; D005858:Germany; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D049690:History, Ancient; D006801:Humans; D007564:Japan; D008175:Lung Neoplasms / Q000453:epidemiology / Q000209:etiology; D009369:Neoplasms / Q000235:genetics / Q000266:history / Q000382:microbiology / Q000628:therapy*; D009374:Neoplasms, Experimental; D009784:Occupational Diseases / Q000266:history; D011827:Radiation; D012907:Smoking / Q000150:complications; D014481:United States; D014780:Viruses