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, May 16, 2022

Anemone coronaria, the poppy anemone, Spanish marigold, or windflower, is a species of flowering plant.
What’s the Difference Between Angiosperms and Gymnosperms?
It’s (mostly) all about the seeds.
Demystified / Science
Two young Bactrian Camel (Camelus bactrianus) in winter steppe in Kyrgyzstan (Kirghizia) bordering Kazakhstan. Asia, Independent Mongolia
8 Animals That Live in Extreme Environments
From extreme heat to extreme cold, animals have adapted to a wide range of conditions in fantastic ways.
#WTFact / Science
Puppy dog having a bath looking into the camera. Wet dog, canines
Why Do Wet Dogs Have A Wet Dog Smell?
It seems counterintuitive that a clean wet animal could be so stinky.
Companion / Science
cloning. First cloned cat. First cloned companion animal. CC (copy cat) female domestic shorthair cat (b. Dec. 22, 2001) photo Jan. 18, 2002. Cloned at Texas A&M Univ. College of Vet. Med. & Biomedical Sciences. Reproductive cloning genetics DNA cc cat
CC, The First Cloned Cat
Don’t you ever just wish there were two of your cat?
List / Science
Large Hadron Collider
physical science
physical science, the systematic study of the inorganic world, as distinct from the study of the organic world, which is...
Encyclopedia / Science
astronaut outside the International Space Station
space exploration
space exploration, investigation, by means of crewed and uncrewed spacecraft, of the reaches of the universe beyond Earth’s...
Encyclopedia / Science
Babylonian mathematical tablet
mathematics
mathematics, the science of structure, order, and relation that has evolved from elemental practices of counting, measuring,...
Encyclopedia / Science
Aristotle
philosophy of science
philosophy of science, the study, from a philosophical perspective, of the elements of scientific inquiry. This article discusses...
Encyclopedia / Science

Science Quizzes

Specially designed Cassini orbits place Earth and Cassini on opposite sides of Saturn's rings, a geometry known as occultation. Cassini conducted the first radio occultation observation of Saturn's rings on May 3, 2005. (solar system, planets)
Saturn
What’s in Saturn’s atmosphere? Who discovered Saturn’s rings? What are the seasons like? Test your knowledge about these...
Quiz / Science
Double exposure of science laboratory test tubes with bokeh and chemical reaction
Types of Chemical Reactions
Can you identify which type of chemical reaction is shown? Test your knowledge with this quiz!
Quiz / Science
Pollination. Bee collecting pollen & nectar from a flower. Plant insect
Biodiversity Loss
Do you know about the threats facing nonhuman life on Earth? Take this quiz to test your knowledge.
Quiz / Science
Plastic bag garbage on beach. (pollution; land fill; trash; water pollution; waste)
Pollution
The pollution of Earth’s waterways, land, and atmosphere has created one of the most serious environmental challenges facing...
Quiz / Science
Planet Neptune
Giants of Our Solar System
Sometimes called the gas, ice, or giant planets, Jupiter, Saturn, Uranus, and Neptune also go by the name Jovian planets....
Quiz / Science
Honeybees working on honeycomb.
Bees Quiz
How much do you know about bees? Test your knowledge with this quiz.
Quiz / Science
Concept artwork on the periodic table of elements.
118 Names and Symbols of the Periodic Table Quiz
The periodic table is made up of 118 elements. How well do you know their symbols? In this quiz you’ll be shown all 118 chemical...
Quiz / Science
pigeon. pigeon and dove. member of the order Columbiformes, family Columbidae
Which Bird? Quiz
What bird is sometimes called the mound builder? What flightless bird has been known to kill humans? Test your knowledge...
Quiz / Science
Great Grey Owl or Great Gray Owl (Strix nebulosa), Alaska. Wood owls, birds.
All About Birds Quiz
What is a gizzard? Who won a Nobel Prize for quacking at baby ducks? Test what you know about birds with this quiz.
Quiz / Science
Italian physicist Guglielmo Marconi at work in the wireless room of his yacht Electra, c. 1920.
All About Physics Quiz
Who was the first scientist to conduct a controlled nuclear chain reaction experiment? What is the unit of measure for cycles...
Quiz / Science
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Science
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Science Subcategories

Neil Armstrong Astronomy
Human beings have long been fascinated by the celestial sphere above, whose twinkling lights have inspired not only scientific theories but also many artistic endeavors. Humankind's fascination with the world beyond Earth has led to many landmark moments in history, as when space exploration took a giant step forward with the advent of technology that allowed humans to successfully travel to the Moon and to build spacecraft capable of exploring the rest of the solar system and beyond.
Articles
subcategory placeholder Biology
How do plants feed themselves? How did dogs evolve from wolves? What good is the appendix in humans, anyway? Such questions fall within the domain of biology, which seeks to understand living organisms and their vital processes (although the jury’s still out on what our appendixes are for). Biology’s diverse fields include botany, ecology, evolution, genetics, medicine, physiology, and zoology.
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 the 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 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 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
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
Mammals are distinguished by their ability to produce milk. The class Mammalia boasts tremendous diversity in form and habit, and different types of mammals can be wildly different from one another in physical appearance. Living kinds of mammals range in size from a bat weighing less than a gram to the largest animal that has ever lived, the blue whale, which reaches a length or more than 30 metres (100 feet) and a weight of 180 metric tons (nearly 200 short [U.S.] tons).
Articles
subcategory placeholder Mathematics
Mathematics is a science of structure, order, and relation that deals with logical reasoning and quantitative calculation. The history of mathematics can be traced back to ancient Mesopotamia; ancient clay tablets have proven 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). 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? Matter is the material substance that constitutes our whole observable universe, and it is the subject of study of physics. Physics, the basic physical science, studies objects ranging from the very small (using quantum mechanics) to the entire universe (using general relativity). It deals with the structure of matter and how the fundamental constituents of the universe interact.
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