Portal:Science
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Science is a systematic discipline that builds and organises knowledge in the form of testable hypotheses and predictions about the world. Modern science is typically divided into two or three major branches: the natural sciences (e.g., physics, chemistry, and biology), which study the physical world; and the behavioural sciences (e.g., economics, psychology, and sociology), which study individuals and societies. The formal sciences (e.g., logic, mathematics, and theoretical computer science), which study formal systems governed by axioms and rules, are sometimes described as being sciences as well; however, they are often regarded as a separate field because they rely on deductive reasoning instead of the scientific method or empirical evidence as their main methodology. Applied sciences are disciplines that use scientific knowledge for practical purposes, such as engineering and medicine. (Full article...)
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A chemical element is a chemical substance that cannot be broken down into other substances by chemical reactions. The basic particle that constitutes a chemical element is the atom. Elements are identified by the number of protons in their nucleus, known as the element's atomic number. For example, oxygen has an atomic number of 8, meaning each oxygen atom has 8 protons in its nucleus. Atoms of the same element can have different numbers of neutrons in their nuclei, known as isotopes of the element. Two or more atoms can combine to form molecules. Chemical compounds are molecules made of atoms of different elements, while mixtures contain atoms of different elements not necessarily combined as molecules. Atoms can be transformed into different elements in nuclear reactions, which change an atom's atomic number. (Full article...)
Did you know...
- ... that Charles Leslie Richardson was ordered to "make science fashionable in the army"?
- ... that an investigation found that most Mexican nutrition science students could not interpret a nutritional front-of-package labeling system correctly?
- ... that science fiction authors who want to avoid the paradoxes associated with time travel may instead write about time viewers?
- ... that the Ahichchhatra Jain temples were built to commemorate the attainment of kevala jnana (omniscience) by Parshvanatha, the 23rd tirthankara of Jainism?
- ... that Margareth Rago seeks to establish a methodology for what she calls "feminist science"?
- ... that Ladislav Burlas, a musicologist at the Slovak Academy of Sciences for almost 40 years, wrote more than 150 works during his career?
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Science News
- 24 September 2024 –
- Scientists from the University of Waterloo announce that they have positively identified bones found on King William Island in Nunavut, Canada, as those of James Fitzjames, captain of HMS Erebus during Franklin's lost expedition. (CBC News)
- 23 September 2024 – Deforestation of the Amazon rainforest
- Climate researchers report that since 1985, deforestation in the Amazon has caused the loss of an area of rainforest equal to the combined area of France and Germany. (France 24)
- 22 September 2024 –
- Researchers from the University of Cape Town and the Max Planck Institute for Evolutionary Anthropology announce they have reconstructed the oldest human genome ever found, belonging to a man and a woman who lived about 10,000 years ago in the Mesolithic period. The prior oldest decoded genome was from about 2,000 years ago. (DW)
- 15 September 2024 – Polaris program
- The spacecraft of the Polaris Dawn private spaceflight mission operated by SpaceX returns to Earth after five days in orbit. (BBC News)
- 12 September 2024 – Polaris program
- American billionaire Jared Isaacman becomes the first person to perform a commercial spacewalk as part of the Polaris Dawn private spaceflight mission operated by SpaceX. (AP)
- 11 September 2024 – Spaceflight
- Following the launch of the Russian Soyuz MS-26 spacecraft from the Baikonur Cosmodrome in Kazakhstan, there were a record 19 people in outer space: the three astronauts on the MS-26 mission, three more on China's Tiangong space station, four people on the SpaceX Polaris Dawn mission, and nine more on board the International Space Station. (CollectSPACE)