Biology, Earth Science, and the Universe Beyond
Life on Earth is shaped by genetics, evolution, and ecology. The planet itself is shaped by geology, oceans, weather, and climate. And both exist within a universe of stars, galaxies, and the possibility of exploration beyond our atmosphere.
Genetics, Evolution, and the Living World
How life works at every scale, from the molecules inside a single cell to the ecosystems that span continents, and the evolutionary processes that connect all living things.
Genetics & DNA
DNA structure, gene expression, CRISPR, epigenetics, genetic testing, genomics, and how the code of life is read, copied, and edited. 25 guides.
Evolution
Natural selection, speciation, human evolution, mass extinctions, the fossil record, and the evidence for the process that shaped all life on Earth. 22 guides.
Cell Biology
Cell structure, organelles, mitosis, meiosis, cell signaling, stem cells, cancer biology, and the fundamental unit of all living organisms. 22 guides.
Microbiology
Bacteria, viruses, fungi, the immune system, the microbiome, antibiotic resistance, and the invisible organisms that shape health and ecosystems. 22 guides.
Ecology
Food webs, biomes, biodiversity, conservation, invasive species, ecosystem services, and how living communities interact with their environments. 22 guides.
Our Planet, Its Climate, and the Cosmos
The forces that shape Earth's surface, atmosphere, and oceans, the energy systems that power civilization, and the universe that stretches beyond our atmosphere.
Astronomy
Stars, galaxies, black holes, dark matter, exoplanets, the Big Bang, and the tools and techniques for observing the universe. 28 guides.
Space Exploration
Rockets, orbital mechanics, Mars missions, the space station, satellites, interstellar travel, and the science of venturing beyond Earth. 22 guides.
Climate Science
The greenhouse effect, carbon cycle, sea level rise, climate models, tipping points, and the science behind Earth's changing climate. 25 guides.
Renewable Energy
Solar, wind, hydroelectric, geothermal, hydrogen fuel cells, energy storage, grid integration, and the transition away from fossil fuels. 25 guides.
Geology
Plate tectonics, earthquakes, volcanoes, rock types, fossils, erosion, groundwater, and the processes that built and continue to reshape the Earth. 22 guides.
Ocean Science
Currents, tides, marine ecosystems, coral reefs, deep sea exploration, ocean chemistry, and the science of the water that covers 71% of Earth. 18 guides.
Weather Science
How weather forms, atmospheric pressure, cloud types, hurricanes, tornadoes, forecasting, and the science of the atmosphere in action. 20 guides.