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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, February 25, 2021

    Freaky Fluorescent Frog Found
    Scientists have discovered the first known species of fluorescent frog.
    #WTFact / Science
    The polka-dot treefrog (Hypsiboas punctatus).
    10 Animals Evolution Plucked Straight Out of a Nightmare
    Someone call Mr. Sandman, because these strange animals will keep you up at night.
    List / Science
    Japanese spider crab
    Why Do Some Animals Hibernate?
    And are they really sleeping?
    Demystified / Science
    American black bears (Ursus americanus), mother with cub in forest.
    What Is the Difference Between Primary and Secondary Ecological Succession?
    Learn more about how ecosystems change over time.
    Companion / Science
    Path through summer forest in the Ukraine. (trees, lush, green, walk, walkway, road, Ukrainia, Ukrainian, woods)
    Star
    Star, any massive self-luminous celestial body of gas that shines by radiation derived from its internal energy sources....
    Encyclopedia / Science
    open cluster NGC 290
    Metabolism
    Metabolism, the sum of the chemical reactions that take place within each cell of a living organism and that provide energy...
    Encyclopedia / Science
    mitochondria and cellular respiration
    Big Science
    Big Science, style of scientific research developed during and after World War II that defined the organization and character...
    Encyclopedia / Science
    Scientific theory
    Scientific theory, systematic ideational structure of broad scope, conceived by the human imagination, that encompasses a...
    Encyclopedia / Science

    Science Quizzes

    The brown bear (Ursus arctos), grizzly bear in the wilderness, Alaska.
    Bear in Mind: Fact or Fiction?
    Do brown bears live in the southern hemisphere? Do polar bears travel? Sort out the facts in this quiz about bears.
    Dama gazelle (Nanger (or Gazella) dama)
    Antelopes: Fact or Fiction?
    Do antelopes have good hearing? Do gazelles have any teeth? Discover the answers to these questions and more in this quiz...
    Cattle. Cow. Bovine. Livestock. Farm animals. Pregnant brown and white dairy cow.
    Bovine: Fact or Fiction?
    Which country raises the most cattle? Are cape buffalo the same size as elephants? Sort out the facts in this quiz all about...
    Pig. Hog. Suidae. Sus. Swine. Piglets. Farm animals. Livestock. Pig sitting in mud.
    Animal Adventures: Fact or Fiction?
    Can animals survive being frozen? Do only male animals have antlers? Test your knowledge of a variety of incredible animals...
    Three types of eels. Fish / Anguilliformes / American eel (Anguilla rostrata), European eel (Anguilla anguilla), conger eel (Conger oceanicus)
    Eels: Fact or Fiction?
    Do eels live in freshwater and saltwater? How many kinds of eels exist? Find the answers to these electrifying questions...
    Hedgehogs. Insectivores. Erinaceus europaeus. Spines. Quills. Close-up of a hedgehog rolled up.
    Animal Jumble: Fact or Fiction?
    Are elks vegetarians? How much does the smallest mongoose weigh? Test your knowledge of a diverse group of animals from the...
    Albert Einstein ca. 1947.  German-born physicist who developed the special and general theories of relativity and won the Nobel Prize for Physics.
    All About Einstein
    You’ve probably heard of Nobel Prize-winner Albert Einstein, but how much do you know about his life and work? Test your...
    Cyclone winds in aerial of clouds.  (hurricane; storm; wind) This image is most likely digitally altered.
    Climate Change
    Which gases play an important role in climate change? What percentage of scientists agree that humans contribute to this...
    Thunderstorm cloud-to-ground lightning discharge with cumulonimbus clouds in field. weather storm thunderstorm atmospheric disturbance cumulonimbus clouds thunder and lightning Homepage blog 2011, science and technology
    Climate Change: Fact or Fiction?
    What is causing the oceans to become more acidic? Do plants and animals have alternatives to migration in the face of climate...
    Weed. Flower. Taraxacum. Dandelion. T. officinale. Close-up of yellow dandelion flowers.
    This or That? Annual vs. Perennial
    Do you know which plants come back year after year? Test your knowledge of annuals and perennials with this quiz.
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    Science Subcategories

    Neil Armstrong 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
    subcategory placeholder 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
    banded fire salamander (Salamandra terrestris) 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
    microfauna 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
    Crustal abundances of elements of atomic numbers 1 to 93. 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
    Seed fern 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
    Earth's 25 terrestrial hot spots of biodiversity 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
    platypus 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
    subcategory placeholder 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
    Rafflesia flower 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
    Schematic diagram of a flotation separation cell. 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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