Category
Natural Sciences
Mathematics, physics, chemistry, biology and the Earth sciences: the discoveries that explain the universe and life, and the efforts to protect the natural world.
21 timelines
- Amazon Rainforest
The Amazon's forests, rivers and human landscapes, from Eocene tropical ecosystems through Indigenous land use, extraction and infrastructure to conservation and deforestation monitoring through 2024.
- Antarctica
Antarctica from the breakup of Gondwana and continental glaciation to exploration, international scientific cooperation, environmental protection and ice observations through 2025.
- Black Holes
The theory and observation of black holes from 1784 to 2022: John Michell's Newtonian "dark stars", Karl Schwarzschild's solution, Cygnus X-1, Hawking radiation, gravitational waves from merging black holes and the Event Horizon Telescope images.
- Calculus
How calculus took shape, from Archimedes' use of the method of exhaustion in the 3rd century BCE through the Kerala school, Newton and Leibniz to the rigorous foundations of Cauchy, Weierstrass and Dedekind by 1872.
- Climate Change
The science of human-caused warming, from Fourier's work in 1824 through greenhouse-gas experiments, measurements, climate models and international assessments to observations reported in 2026.
- Conservation Movement
Efforts to protect wildlife and habitats, from ancient restrictions on animal killing to conservation science, community forestry and international biodiversity agreements through 2026.
- Earth's History
The physical history of Earth, from its formation about 4.54 billion years ago through changing continents, oceans and climates to the start of the Holocene about 11,700 years ago.
- Evolutionary History of Life
Life on Earth from microbial evidence about 3.5 billion years ago to Homo sapiens about 300,000 years ago, tracing changes in cells, bodies and ecosystems through an incomplete fossil record.
- Geometry
Geometry from Egyptian and Babylonian scribes of about 1850–1800 BCE through Euclid, non-Euclidean geometry and topology to Grigori Perelman's 2002–2003 proof of the Poincaré conjecture.
- Mass Extinctions
Major extinction pulses from about 445 million to 66 million years ago, followed by the research that connected the fossil record to extinction, volcanism and asteroid impacts, through 2016.
- Mathematics
Mathematics worldwide from Babylonian tablets of about 1800 BCE through Egyptian, Greek, Chinese, Indian and Islamic advances to modern algebra, logic and computer-assisted proof, ending with the 1995 proof of Fermat's Last Theorem.
- Ocean Exploration
Scientific exploration of the sea from eighteenth-century measurements to deep submersibles, hydrothermal vents, autonomous floats and the global seafloor-mapping effort, through 2025.
- Ozone Layer
The discovery, measurement and protection of stratospheric ozone, from identifying ozone in 1840 to the Antarctic ozone hole, international chemical controls and evidence of recovery through 2023.
- Particle Physics
Subatomic particles, accelerators and the Standard Model, from J. J. Thomson's identification of the electron in 1897 to the discovery of the Higgs boson at the Large Hadron Collider in 2012.
- Physics
From ancient times to the frontiers of modern research: exploring the major discoveries, theories, and personalities that have shaped our understanding of the universe and paved the way for technological progress.
- Pi
Approximations and computations of π, from Babylonian and Egyptian values of about 1900–1550 BCE through polygon methods, infinite series and proofs of irrationality and transcendence to the 314-trillion-digit record of 2025.
- Plate Tectonics
How moving continents became a testable theory of Earth, from matching coastlines in 1596 through seafloor spreading and plate models to direct measurements of motion in the 1990s.
- Probability and Statistics
The mathematics of chance and the science of data over more than 360 years, from Pascal and Fermat's letters of 1654 and Cardano's dice treatise through Bayes, Gauss and Fisher to computer-age methods and the American Statistical Association's 2016 statement on p-values.
- Quantum Mechanics
The development of quantum mechanics, from Max Planck's energy quanta of 1900 through the theory's founding in the 1920s and the debates over entanglement to the Bell tests honored by the 2022 Nobel Prize in Physics.
- Theory of Relativity
The special and general theories of relativity, from the Michelson–Morley experiment of 1887 through Albert Einstein's theories of 1905 and 1915 to experimental tests up to 2026, including the gravitational-wave detections of 2015 and 2017.
- Thermodynamics
The science of heat and temperature, from Galileo's air thermoscope of the 1590s through Carnot, the laws of thermodynamics and statistical mechanics to record cold near absolute zero in 2021.