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    Science

    How can the sky be blue one day and stormy the next? Why do heavy objects tend to fall downwards when dropped? How are birds able to fly (and why can’t I do the same?)? Human beings have long been curious about the world in which we live, striving to identify connections among the phenomenons we witness and to understand how it all works. The field of science has developed over many centuries as a way of studying and understanding the world, beginning with the primitive stage of simply noting important regularities in nature and continuing through the rise of modern science. The modern-day sciences cover a vast range of fields, including biology, chemistry, meteorology, astronomy, physics, and much more.
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    Featured content, November 24, 2020

    10 Deadly Animals that Fit in a Breadbox
    Tiny terrors of the animal kingdom.
    #WTFact / Science
    Mosquito on human skin.
    6 Interesting Facts about Srinivasa Ramanujan
    Some things to know about one of the world’s greatest mathematicians.
    Companion / Science
    Srinivasa Ramanujan, Indian mathematician and autodidact.
    7 Awesome Frog Species of Canada and the United States
    Are these your favorites, too?
    List / Science
    Northern Pacific tree frog (Pseudacris regilla) also known as the Pacific chorus frog in a green and brown morph on dewy leaf about to leap.
    Why Doesn’t the U.S. Use the Metric System?
    In a metric world, why does the U.S. choose to be different?
    Demystified / Science
    Centimetres vs inches, metal rulers on a white background with clipping path.
    Hypothesis
    Hypothesis, something supposed or taken for granted, with the object of following out its consequences (Greek hypothesis,...
    Encyclopedia / Science
    flow chart of scientific method
    Muscle
    Muscle, contractile tissue found in animals, the function of which is to produce motion. Movement, the intricate cooperation...
    Encyclopedia / Science
    striated muscle; human biceps muscle
    Principles of physical science
    Principles of physical science, the procedures and concepts employed by those who study the inorganic world. Physical science,...
    Encyclopedia / Science
    Figure 1: Data in the table of the Galileo experiment. The tangent to the curve is drawn at t = 0.6.
    Plant
    Plant, (kingdom Plantae), any multicellular eukaryotic life-form characterized by (1) photosynthetic nutrition (a characteristic...
    Encyclopedia / Science
    Weeping willow (Salix babylonica).

    Science Quizzes

    atom. Orange and green illustration of protons and neutrons creating the nucleus of an atom.
    Chemistry and Biology: Fact or Fiction?
    Are enzymes catalysts? Are atoms invisible? Sort fact from fiction—and cell biology from chemical reactions—in this chemistry...
    George Washington Bridge vehicular suspension bridge crossing the Hudson River, U.S. in New York City. When finished in 1931 it was the longest in the world. Othmar Ammann (Othmar Herman Ammann) engineer and designer of numerous long suspension bridges.
    Architecture and Building Materials: Fact or Fiction?
    Is concrete a mixture of sand and steel? Do suspension bridges hang from cables? Test the strength of your knowledge of architecture...
    wasp. Vespid Wasp (Vespidaea) with antennas and compound eyes drink nectar from a cherry. Hornets largest eusocial wasps, stinging insect in the order Hymenoptera, related to bees. Pollination
    Animals and Insects: Fact or Fiction?
    Is a humbug a kind of bee? Does mutualism refer to an animal’s selfishness? Sort fact from fiction in this animals and insects...
    Woman opening umbrella on windy day. (monsoon; rain; raincoat; wind)
    Weather and Seasons: Fact or Fiction?
    Do January and June contain equinoxes? Does the summer solstice mark the end of summer? See if your knowledge is foggy or...
    space shuttle. Space Shuttle Columbia (OV-102) leaving launching pad, Kennedy Space Center, Florida. Columbia launch. Destroyed at re-entry Feb. 1, 2003 at the end of its 28th mission. Blog, homepage, launch pad, lifting off, lift-off, lift off
    Space Exploration: Fact or Fiction?
    Were all the Apollo astronauts trained scientists? Is the European Space Agency a branch of NASA? Liftoff into this space...
    gray wolf. Wolf. Gray wolf (Canis lupus) grey wolf also called timber wolf largest wild member of the dog family (Canidae). Endangered species.
    Cry Wolf: Fact or Fiction?
    What do wolves eat? How many species of wolves are there? Sort out the facts about wolves and their habits.
    Camel. Camelus. Desert. Sand. Sunset. Camel with colorful saddle crosses desert in India at dusk.
    Camels: Fact or Fiction?
    Do you know where camels originated? Exactly how long can they go without water, anyway? Sort out the facts about camels...
    Dark-fingered coral crab in an Indo-Pacific coral reef. (coral reefs; endangered area; ocean habitat; sea habitat)
    Crustaceans: Fact or Fiction?
    Can crabs only live in salt water? Do crabs experience metamorphosis? Sort out the facts in this quiz all about crustaceans.
    tropical two-wing flying fish (Exocoetus volitans). Beloniformes, ichthyology, fish plates, marine biology, tropical two wing flying fish, tropical two-wing flyingfish, tropical two wing flyingfish, tropical fish, fishes, animals.
    Fish in the Sea: Fact or Fiction?
    Can fish get thirsty? Do sharks use electricity to hunt? Sort out the facts in this quiz about our finned friends.
    Turtle, green turtle, Chelonia mydas, chelonian, reptile, animal
    Turtles: Fact or Fiction?
    Can turtles catch colds? Can turtles run? Get under the shells of these reptiles in this fun quiz.
    Image Gallery
    Science
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    Science Subcategories

    subcategory placeholder Astronomy
    Human beings have always been fascinated by the celestial sphere above, whose twinkling lights have inspired many theories and artistic endeavors. Study of the solar system has provoked more than just peaceful meditation, however; a major controversy among astronomers arose in the 16th century when Copernicus publicly championed heliocentrism, a Sun-centric model of the solar system that was in direct opposition to Ptolemy's Earth-centered model, which had been generally accepted from the 2nd century CE onward. But humankind's fascination with the world beyond Earth has also led to some landmark moments in history, as when space exploration took a giant step forward with the advent of technology that allowed humans to travel to the Moon and to build spacecraft capable of exploring the rest of the solar system and beyond.
    Articles
    Chordate Biology
    If it’s alive, biology will define it, study it, observe all its functions, follow its vital processes, and interact with it, all in order to understand the life that animates it. In one of biology's best-known examples of such studious investigation, Charles Darwin came up with his scientific theory of evolution by natural selection after systematically observing a variety of plants and animals; his work acted as the foundation upon which modern evolutionary theory is built. But biology’s principles also operate within a plethora of other related fields, including biochemistry, biomedicine, biophysics, and microbiology.
    Articles
    Black girdle-tailed lizard (Cordylus nigra). Birds, Reptiles & Other Vertebrates
    Although it can be hard to imagine that a peacock and a crocodile have much of anything in common, these animals are actually descendants of the same prehistoric vertebrates. Birds are thought to have descended from carnivorous dinosaurs that began growing feathers by the Late Jurassic Period; thus, birds are technically one lineage of reptiles. This evolutionary link highlights the way in which seemingly incongruous creatures can, in fact, share a common ancestor (though that doesn't mean that we should expect waterfowl and crocodiles to become friends anytime soon).
    Articles
    Mantid (Mantis religiosa). Bugs, Mollusks & Other Invertebrates
    Some insects are so displeasing to humans that the word "bug" has come to be used as a verb meaning "to bother or annoy." Yet, in addition to being critically important—because they naturally recycle decaying matter—in maintaining balance within the food chain, bugs can also be fascinating creatures, whether in regard to the water strider's ability to run across the surface of water or in regard to assassin bugs' varied and creative means of catching and killing their prey. Mollusks, another group of invertebrates, get less of a bad rap. Their ranks include nearly 100,000 described species of soft-bodied animals that are usually wholly or partly enclosed in a calcium carbonate shell; examples include snails, clams, oysters, squids, and octopuses.
    Articles
    periodic table Chemistry
    How do you use raw plant materials to manufacture a best-selling perfume? How do you engineer household products that are compliant with environmentally-oriented guidelines? The answers to these questions require an understanding of the laws of chemistry, the science that deals with the properties, composition, and structure of elements and compounds, as well as the transformations that such substances undergo and the energy that is released or absorbed during those processes. Chemistry is also concerned with the utilization of natural substances and the creation of artificial ones. Over time, more than 8,000,000 different chemical substances, both natural and artificial, have been characterized and produced. Chemistry's vast scope comprises organic, inorganic, physical, analytical, and industrial chemistry, along with biochemistry, environmental chemistry, medicinal chemistry, and much more. Through the dedicated efforts of people such as Robert Boyle, Dmitri Mendeleev, John Dalton, Marie Curie, and Rosalind Franklin, the field of chemistry has led to exciting innovations as well as crucial advances in our understanding of how the world functions, starting with just the miniscule and unassuming atom.
    Articles
    subcategory placeholder Earth Science, Geologic Time & Fossils
    Planet Earth has billions of years of history, from the time when it was an inhospitable ball of hot magma to when its surface stabilized into a variety of beautiful and diverse zones capable of supporting many life-forms. Many are the species that lived through the various geologic eras and left a trace of their existence in the fossils that we study today. But Earth is never done settling, as we can see from the earthquakes, tsunamis, volcanic eruptions, and other phenomena manifested in Earth’s crust, oceans, and atmosphere.
    Articles
    Grinnell Glacier shrinkage Environment
    Biological diversity is key to a healthy ecosystem, whether it’s a small biological community or the global biosphere. Ecology, which studies the relationships between organisms and their environment, is an invaluable science that helps us understand what allows an ecological community to thrive.
    Articles
    Meerkat, or suricate (Suricata suricatta). Mammals
    These are the animals to which humans tend to relate the most, perhaps because aspects of their behavior can sometimes resemble the way that we ourselves behave. The protective instinct of a mother bear, the gamboling way that kittens play, and the loyalty displayed by a dog are all traits that we can identify with in the course of our own lives. Mammals are well-equipped to handle different climates and biomes because of their ability to regulate their own body temperatures and internal environment, both in excessive heat and aridity and in severe cold.
    Articles
    Plot of the cubic equation f(x) = x3 ? 3x + 2. The plotted points are where changes in curvature occur. Mathematics
    Although stock portrayals of mathematicians often involve a studious person standing in front of a chalkboard that's covered with mind-bogglingly complex scrawled mathematical problems (call it the "Good Will Hunting" effect), the chaotic-looking equations may obscure the fact that mathematics is, at its heart, a science of structure, order, and relation that deals with logical reasoning and quantitative calculation. There's a method to all that madness! The history of mathematics can be traced back to ancient Mesopotamia, whose clay tablets revealed that the level of mathematical competence was already high as early as roughly the 18th century BCE. Over the centuries, mathematics has evolved from elemental practices of counting, measuring, and describing the shapes of objects into a crucial adjunct to the physical sciences and technology.
    Articles
    mandacaru cactus Plants
    Life on Earth owes much to plants. The vast majority of plants carry out photosynthesis to transform light energy into chemical energy, which is the way that virtually all energy in the biosphere becomes available to living things (including us humans). As photosynthetic organisms, plants occupy the base of Earth's food webs and are consumed directly or indirectly by all higher life-forms, thereby functioning as the major source of food for humans and other animals. Plants' photosynthetic activity also produces the air that we breathe: almost all the oxygen in the atmosphere is due to the process of photosynthesis. Still not convinced about the merits of plants? Consider the fact that many plants not only serve up crucial nutrients and breathable air but also look good doing it. Many plants are admired for their striking aesthetic qualities, and flowers such as tulips, lilies, sunflowers, and daisies beautify fields, gardens, windowsills, and bouquets the world over. Plants are also a primary source of consumer goods, such as building materials, textile fibers, and pharmaceuticals.
    Articles
    Acoustics Physics
    What’s the matter? The matter is our whole observable universe—with that material substance that constitutes it—and it is the subject of study of physics. The laws that govern motion observed by Newton, the gravitational force that regulates the progress of all celestial bodies, the interaction between subatomic particles, and the nuclear engineering that created the atomic bomb are examples of what this important discipline is all about. Minkowski’s space-time concept, which reformulated Einstein’s special theory of relativity, has bridged physics with philosophy in a conversation that has fascinated the modern concept of physics.
    Articles
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