1. Kapitel. Naturwissenschaft und Erfahrung -- 2. Kapitel. Die Mitwirkenden -- 3. Kapitel. Das Ende der Welt -- 4. Kapitel. Der Niedergang des Determinismus -- 5. Kapitel. Indeterminismus und Quantentheorie -- 6. Kapitel. Wahrscheinlichkeit -- 7. Kapitel. Der Bau der Sterne -- 8. Kapitel. Inneratomare Energie -- 9. Kapitel. Kosmische Wolken und Nebel -- 10. Kapitel. Die Expansion des Weltalls -- 11. Kapitel. Die Naturkonstanten -- 12. Kapitel. Die Gruppentheorie -- 13. Kapitel. Kritiken und Kontroversen -- 14. Kapitel. Ausklang.
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Erstes Kapitel: Der Sturz der klassischen Physik -- Zweites Kapitel: Relativität -- Drittes Kapitel: Die Zeit -- Viertes Kapitel: Der Ablauf des Weltgeschehens -- Fünftes Kapitel: "Werden" -- Sechstes Kapitel: Die Gravitation und ihr Gesetz -- Siebentes Kapitel: Die Gravitation und ihre Erklärung -- Achtes Kapitel: Die Stellung des Menschen im Weltall -- Neuntes Kapitel: Die Quantentheorie -- Zehntes Kapitel: Die neue Quantentheorie -- Elftes Kapitel: Weltbau -- Zwölftes Kapitel: Zeigerstellungen -- Dreizehntes Kapitel: Realität -- Vierzehntes Kapitel: Verursachung -- Fünfzehntes Kapitel: Wissenschaft und Mystizismus -- Schlußwort -- Register.
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Prolog: Was ist Geometrie? -- 1. Kapitel: Die Lorentzkontraktion -- 2. Kapitel: Relativität -- 3. Kapitel: Die vierdimensionale Welt -- 4. Kapitel: Kraftfelder -- 5. Kapitel: Raumarten -- 6. Kapitel: Das neue und das alte Gravitationsgesetz -- 7. Kapitel: Schweres Licht -- 8. Kapitel: Weitere Prüfungen der Theorie -- 9. Kapitel: Impuls und Energie -- 10. Kapitel: Der Unendlichkeit entgegen -- 11. Kapitel: Elektrizität und Schwere -- 12. Kapitel: Über die Natur der Dinge.
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IMPORTANCE: The COVID-19 pandemic has affected every aspect of medical care, including surgical treatment. It is critical to understand the association of government policies and infection burden with surgical access across the United States. OBJECTIVE: To describe the change in surgical procedure volume in the US after the government-suggested shutdown and subsequent peak surge in volume of patients with COVID-19. DESIGN, SETTING, AND PARTICIPANTS: This retrospective cohort study was conducted using administrative claims from a nationwide health care technology clearinghouse. Claims from pediatric and adult patients undergoing surgical procedures in 49 US states within the Change Healthcare network of health care institutions were used. Surgical procedure volume during the 2020 initial COVID-19–related shutdown and subsequent fall and winter infection surge were compared with volume in 2019. Data were analyzed from November 2020 through July 2021. EXPOSURES: 2020 policies to curtail elective surgical procedures and the incidence rate of patients with COVID-19. MAIN OUTCOMES AND MEASURES: Incidence rate ratios (IRRs) were estimated from a Poisson regression comparing total procedure counts during the initial shutdown (March 15 to May 2, 2020) and subsequent COVID-19 surge (October 22, 2020-January 31, 2021) with corresponding 2019 dates. Surgical procedures were analyzed by 11 major procedure categories, 25 subcategories, and 12 exemplar operative procedures along a spectrum of elective to emergency indications. RESULTS: A total of 13 108 567 surgical procedures were identified from January 1, 2019, through January 30, 2021, based on 3498 Current Procedural Terminology (CPT) codes. This included 6 651 921 procedures in 2019 (3 516 569 procedures among women [52.9%]; 613 192 procedures among children [9.2%]; and 1 987 397 procedures among patients aged ≥65 years [29.9%]) and 5 973 573 procedures in 2020 (3 156 240 procedures among women [52.8%]; 482 637 procedures among children [8.1%]; and 1 806 074 procedures ...
