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.
Featured content, May 22, 2023
华南永昌配资_在线配资炒股: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.
12 Questions About the History of Space Exploration Answered
How to go boldly where no (or, at least, not many) humans have gone before.
What’s the Difference Between a Psychopath and a Sociopath? And How Do Both Differ from Narcissists?
Know a mentally disturbed person who doesn’t think much of others? Make sure you apply the right epithet.
Simulation, in industry, science, and education, a research or teaching technique that reproduces actual events and processes...
Hypothesis, something supposed or taken for granted, with the object of following out its consequences (Greek hypothesis,...
Climate, conditions of the atmosphere at a particular location over a long period of time; it is the long-term summation...
Cell, in biology, the basic membrane-bound unit that contains the fundamental molecules of life and of which all living things...
Bird’s Eye View: Fact or Fiction?
Are chickens related to pheasants? How many varieties of turkeys exist? Sort out the fact and gain a new perspective on these...
Hyenas and Aardwolves: Fact or Fiction?
Where can aardwolves be found? Do hyenas live in trees? Sort out the facts in this quiz about hyenas and aardwolves.
华南永昌配资_在线配资炒股: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.
华南永昌配资_在线配资炒股: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...
华南永昌配资_在线配资炒股: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...
华南永昌配资_在线配资炒股: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...
Eels: Fact or Fiction?
Do eels live in freshwater and saltwater? How many kinds of eels exist? Find the answers to these electrifying questions...
华南永昌配资_在线配资炒股: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...
华南永昌配资_在线配资炒股: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...
Which gases play an important role in climate change? What percentage of scientists agree that humans contribute to this...
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.
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.
华南永昌配资_在线配资炒股: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).
华南永昌配资_在线配资炒股: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.
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.
- rare-earth element
华南永昌配资_在线配资炒股: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.
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.
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).
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.
- philosophy of mathematics
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.
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.