Portal:Science
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- For a topic outline on this subject, see List of basic topics in science
Science: 
History of science 
Philosophy of science 
Scientific method 
Systems science 
Mathematics 
Biology 
Chemistry 
Physics 
Earth sciences 
Technology and applied sciences
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Scientists maintain that scientific investigation must adhere to the scientific method, a process for properly developing and evaluating natural explanations for observable phenomena based on empirical study and independent verification. Science, therefore, avoids supernatural explanations until all other natural possibilities have been considered, and rejects arguments from authority.
Fields of science are commonly classified along two major lines: Natural sciences, which study natural phenomena; and Social sciences, which study human behavior and societies. Whether mathematics is a science is a matter of perspective.
Fields of science can be further distinguished as pure science or applied science. Pure science is principally involved with the discovery of new truths with less (or no) regard to their applications. Applied science is principally involved with the application of existing knowledge in new ways.
Nanotechnology is any technology which exploits phenomena and structures that can only occur at the nanometer scale, which is the scale of several atoms and small molecules. The United States's National Nanotechnology Initiative website defines nanotechnology as "the understanding and control of matter at dimensions of roughly 1 to 100 nanometers, where unique phenomena enable novel applications."
The Hubble Space Telescope (HST) is a telescope in orbit around the Earth, named after astronomer Edwin Hubble for his discovery of galaxies outside the Milky Way and his creation of Hubble's Law, which calculates the rate at which the universe is expanding. Its position outside the Earth's atmosphere allows it to take sharp optical images of very faint objects, and since its launch in 1990, it has become one of the most important instruments in the history of astronomy. It has been responsible for many ground-breaking observations and has helped astronomers achieve a better understanding of many fundamental problems in astrophysics. Hubble's Ultra Deep Field is the deepest (most sensitive) astronomical optical image ever taken.
It also has very large satellite mirrors which are so precise that even a star 100 light years away can be seen easily.
- ...that the gestation period of the ring-tailed lemur (pictured) is approximately 146 days?
- ...that the Late November 2006 Nor'easter caused winds up to 80 mph (70 knots) in the Outer Banks of North Carolina, the earliest snowfall on record for Savannah, Georgia and Charleston, South Carolina, as well as Charleston, South Carolina's only occurrence of thundersnow on record?
- ...that the Rufous-crowned Sparrow, a medium-sized sparrow of the southwestern United States and Mexico, has a subspecies endemic to the Todos Santos Islands that has not been seen since the 1970s?
- ...that the Christmas 1994 Nor'easter led to wind gusts of 99 mph/86 knots in Massachusetts, and briefly formed an eye?
- ...that the Northern Red-legged Frog is a near-threatened species, whose male defends breeding pond territory with nocturnal displays?
