Alex Curran
Science. Knowledge. TED. Best TED Talks. Khan Academy. From kindergarten to calculus, Khan Academy is here to help.
Sharpen your skills with over 100,000 interactive exercises. Over 100,000 interactive exercises. You may have heard about our videos, but did you know that Khan Academy has fun interactive math exercises that cover skills ranging from counting to calculus, grade by grade? Every exercise has step-by-step hints, so your child can practice as much as needed. Created and peer-reviewed by a team of math educators, our exercises include full coverage of US Common Core and beyond, ranging from early math through calculus. Review student progress in real time.
You will be empowered with instant, in-depth feedback and reports so you’ll know exactly where each student and your class as a whole stand at any time throughout the year. Stay up to date with your child’s progress. You’ll get quick email updates so you can see your children’s progress as they learn, both when they’ve mastered new skills and when they might be struggling.
Open knowledge. Neuroscience. Psych/Neuro. Psychology. Philosophical Talks. Tech. Operating Systems. History of computing hardware. The History of computing hardware covers the developments from simple devices to aid calculation, to mechanical calculators, punched card data processing and on to modern stored-program computers.
Before the 20th century, most calculations were done by humans. Early mechanical tools to help humans with digital calculations were called "calculating machines", by proprietary names, or even as they are now, calculators. The machine operator was called the computer. The first aids to computation were purely mechanical devices which required the operator to set up the initial values of an elementary arithmetic operation, then manipulate the device to obtain the result. The slide rule and, later, analog computers represented numbers in a continuous form, for instance distance along a scale, rotation of a shaft, or a voltage.
Early devices[edit] Ancient era[edit] Suanpan (the number represented on this abacus is 6,302,715,408) The abacus was early used for arithmetic tasks. A slide rule. Scientific Mysteries. Artificial Intelligence. Machine learning. KurzweilAI.net. Brain-Machine. Singularity-Emergence A.I. Robot mind. Semiconductor Companies. Cpu. Robotics, IA and Informatics. Biology. Human anatomy. Genetics. DNA. Human Genome. Physics. Electronic Engineering. Mechanics and Engineering. Space. Solar System. Dark energy. Adding the cosmological constant to cosmology's standard FLRW metric leads to the Lambda-CDM model, which has been referred to as the "standard model" of cosmology because of its precise agreement with observations.
Dark energy has been used as a crucial ingredient in a recent attempt to formulate a cyclic model for the universe.[8] Nature of dark energy[edit] Many things about the nature of dark energy remain matters of speculation. The evidence for dark energy is indirect but comes from three independent sources: Distance measurements and their relation to redshift, which suggest the universe has expanded more in the last half of its life.[9]The theoretical need for a type of additional energy that is not matter or dark matter to form our observationally flat universe (absence of any detectable global curvature).It can be inferred from measures of large scale wave-patterns of mass density in the universe. Effect of dark energy: a small constant negative pressure of vacuum[edit] . Quantum Physics. Science Fiction. 2001 - A space odyssey. Fictional Universe. Science Fiction. Futurism. Transhuman/futurism. Covering technological, scientific, and cultural t.
H+ and contemporary examples. Postmodernism. NBIC. Nanotech. Biology. Genomics. Information. Complexity and Information. Cognitive Science. Future Cities. Urban agriculture. Urban farming. Future Homes. Our Future. The future of everything. Futurist. The Environment. Activism. Politics & Activism. Digital activism.
Anti-racism. Social justice. Uncut. Socialism. Social Development. Sustainable Development & Corporate Social Responsibility. Social media development. Social Innovation. Technology. Inventions/Technology. The Venus Project. Anticapitalism. Socialism / Marxism focus. Communism. International. Internet & Press Freedom. Politics. .Karl Marx. US Politics. Human rights. Amnesty International. Resistance. Hacktivism/Digital Activism/Online Privacy, Security,Anonymity.