43: A cold, yet boiling, cup of tea
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What is the atmosphere? Atmosphere of Earth (Wikipedia) Evolution of Earth's atmosphere (Wikipedia) Earth's early atmosphere (Universe Today) A lecture on Earth's atmosphere (The Ohio State University) Gaseous composition of dry air (Columbia University) Not definitive, but a discussion around 'How is the equilibrium of 21% oxygen in Earth's atmosphere established?' (Earth Science Stack Exchange) The first cells were anaerobic, i.e. they didn't use oxygen (Windows 2 Universe) The great oxygenation event: The event that transformed Earth (BBC) Geological history of oxygen (Wikipedia) Greenhouse gases kept early Earth warm (ABC, Australia) Stromatolites (Wikipedia) Stromatolites: The oldest fossils (Fossil Museum) Photosynthesis (Wikipedia) What is the atmosphere like on other planets? (Universe Today) Planetary atmospheres (Penn State University) Did Mars' magnetic field die with a whimper or a bang? (Science, AAAS) Mars’ magnetic field (Technical University of Denmark) What keeps Earth’s atmosphere bound to…