تجارب علمية بسيطة عن المغناطيس و يوضح السبب في جعل مادة ما تتحول من مادة عديمة التأثر بالجذب المغناطيسي الى مادة فعالة وقابلة للتأثر
- Author:
- Mr. Hacker
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تجاب علمية متنوعة و مثيرة للكبار و الصغار. معلومات علمية متنوعة.
- Author:
- 5-Minute Crafts
HooplakidzLab brings to you 10 amazing science experiments that you can easily do at home using everyday household items. Welcome To HooplakidzLab where science is fun. Today we are here with some of the coolest science experiments you and your little one can try at home.
- Author:
- HooplaKidzLab
Conditional Remix & Share Permitted
CC BY-NC-SA
Explores the changing roles, ethical conflicts, and public perceptions of science and scientists in American society from World War II to the present. Studies specific historical episodes focusing on debates between scientists and the contextual factors influencing their opinions and decisions. Topics include the atomic bomb project, environmental controversies, the Challenger disaster, biomedical research, genetic engineering, (mis)use of human subjects, scientific misconduct and whistleblowing.
- Subject:
- Applied Science
- Environmental Science
- Life Science
- Nutrition
- Material Type:
- Full Course
- Textbook
- Author:
- Foley, Brendan
- Date Added:
- 01/01/2007
Conditional Remix & Share Permitted
CC BY-NC-SA
This course teaches simple reasoning techniques for complex phenomena: divide and conquer, dimensional analysis, extreme cases, continuity, scaling, successive approximation, balancing, cheap calculus, and symmetry. Applications are drawn from the physical and biological sciences, mathematics, and engineering. Examples include bird and machine flight, neuron biophysics, weather, prime numbers, and animal locomotion. Emphasis is on low-cost experiments to test ideas and on fostering curiosity about phenomena in the world.
- Subject:
- Applied Science
- Engineering
- Material Type:
- Full Course
- Textbook
- Author:
- Sanjoy Mahajan
- Date Added:
- 01/01/2008
Ben Goldacre unpicks dodgy scientific claims made by scaremongering journalists, dubious government reports, pharmaceutical corporations, PR companies and quacks. About the speakerBen Goldacre · Debunker Ben Goldacre unpicks dodgy scientific claims made by scaremongering journalists, dubious government reports, pharmaceutical corporations, PR companies and quacks. Doctor and epidemiologist Ben Goldacre shows us, at high speed, the ways evidence can be distorted, from the blindingly obvious nutrition claims to the very subtle tricks of the pharmaceutical industry. Every day there are news reports of new health advice, but how can you know if they're right?
- Author:
- Ben Goldacre
THE SUN is the star at the center of the Solar System and is by far the most important source of energy for life on Earth. It is a nearly perfect spherical ball of hot plasma with internal convective motion that generates a magnetic field via a dynamo process. Its diameter is about 109 times that of Earth, and it has a mass about 330,000 times that of Earth, accounting for about 99.86% of the total mass of the Solar System. Chemically, about three quarters of the Sun's mass consists of hydrogen, whereas the rest is mostly helium, and much smaller quantities of heavier elements, including oxygen, carbon, neon and iron
- Author:
- Heli
Just as dialog, acting, and music are tools filmmakers use to convey meaning and emotion, color can be used to the same effect. But determining “color” is not as simple as saying “red” or “brown” because there are endless shades of color in the visible spectrum. In this lesson, you will learn how color is determined partly by the physics of light and partly by how our brains perceive it.
- Author:
- khanacademy.org
This 13-minute video lesson attempts to comprehend the scale of the small: from honey bees, to cells, to viruses, to atoms. [Cosmology and Astronomy playlist: Lesson 58 of 85]
- Author:
- Khan, Salman
As an expert on cutting-edge digital displays, Mary Lou Jepsen studies how to show our most creative ideas on screens. And as a brain surgery patient herself, she is driven to know more about the neural activity that underlies invention, creativity, thought. She meshes these two passions in a rather mind-blowing talk on two cutting-edge brain studies that might point to a new frontier in understanding how (and what) we think.
- Author:
- Mary Lou Jepsen
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CC BY-NC-SA
The subject of this course is the historical process by which the meaning of "technology" has been constructed. Although the word itself is traceable to the ancient Greek root teckhne (meaning art), it did not enter the English language until the 17th century, and did not acquire its current meaning until after World War I. The aim of the course, then, is to explore various sectors of industrializing 19th and 20th century Western society and culture with a view to explaining and assessing the emergence of technology as a pivotal word (and concept) in contemporary (especially Anglo-American) thought and expression.
- Subject:
- Applied Science
- Arts and Humanities
- Career and Technical Education
- Engineering
- Manufacturing
- World Cultures
- Material Type:
- Full Course
- Textbook
- Author:
- Marx, Leo
- Williams, Rosalind
- Date Added:
- 01/01/2005
Conditional Remix & Share Permitted
CC BY-NC-SA
This course considers the interaction between law, policy, and technology as they relate to the evolving controversies over control of the Internet. In addition, there will be an in-depth treatment of privacy and the notion of "transparency" -- regulations and technologies that govern the use of information, as well as access to information. Topics explored will include: Legal Background for Regulation of the Internet Fourth Amendment Law and Electronic Surveillance Profiling, Data Mining, and the U.S. PATRIOT Act Technologies for Anonymity and Transparency, The Policy-Aware Web
- Subject:
- Applied Science
- Computer Science
- Material Type:
- Full Course
- Textbook
- Author:
- Abelson, Harold
- Date Added:
- 01/01/2005
This lesson is a presentation of famous scientist throughout history where the students will learn and take notes about the contributions and discoveries made in science.
- Author:
- Pam Schilling
Conditional Remix & Share Permitted
CC BY-NC-SA
Examines the development of computing techniques and technology in the nineteenth and twentieth centuries, particularly critical evaluation of how the very idea of "computer" changes and evolves over time. Emphasis is on technical innovation, industrial development, social context, and the role of government. Topics include Babbage, Hollerith, differential analyzers, control systems, ENIAC, radar, operations research, computers as scientific instruments, the rise of "computer science," artificial intelligence, personal computers, and networks. Includes class visits by members of the MIT community who have made important historical contributions. This course focuses on one particular aspect of the history of computing: the use of the computer as a scientific instrument. The electronic digital computer was invented to do science, and its applications range from physics to mathematics to biology to the humanities. What has been the impact of computing on the practice of science? Is the computer different from other scientific instruments? Is computer simulation a valid form of scientific experiment? Can computer models be viewed as surrogate theories? How does the computer change the way scientists approach the notions of proof, expertise, and discovery? No comprehensive history of scientific computing has yet been written. This seminar examines scientific articles, participants' memoirs, and works by historians, sociologists, and anthropologists of science to provide multiple perspectives on the use of computers in diverse fields of physical, biological, and social sciences and the humanities. We explore how the computer transformed scientific practice, and how the culture of computing was influenced, in turn, by scientific applications.
- Subject:
- Applied Science
- Computer Science
- Linguistics
- Social Science
- Material Type:
- Full Course
- Textbook
- Author:
- Gerovitch, Slava
- Date Added:
- 01/01/2004
This lesson emphasizes the connections between science and mathematics by using a performance, or authentic, assessment format. Students will develop measurement skills as they relate the size of their fists to the size of their hearts. Students have the opportunity to explore applications involving their own hearts. An activity sheet (pdf) is included.
- Author:
- Lisa M. Passarello and Francis (Skip) Fennell
Moshe Szyf is a pioneer in the field of epigenetics, the study of how living things reprogram their genome in response to social factors like stress and lack of food. His research suggests that biochemical signals passed from mothers to offspring tell the child what kind of world they're going to live in, changing the expression of genes. "DNA isn't just a sequence of letters; it's not just a script." Szyf says. "DNA is a dynamic movie in which our experiences are being written."
How to check and remove virus from your computer without using any antivirus
- Author:
- sandeep singh
Introduction to the Modeling and Analysis of Complex Systems introduces students to mathematical/computational modeling and analysis developed in the emerging interdisciplinary field of Complex Systems Science. Complex systems are systems made of a large number of microscopic components interacting with each other in nontrivial ways. Many real-world systems can be understood as complex systems, where critically important information resides in the relationships between the parts and not necessarily within the parts themselves. This textbook offers an accessible yet technically-oriented introduction to the modeling and analysis of complex systems. The topics covered include: fundamentals of modeling, basics of dynamical systems, discrete-time models, continuous-time models, bifurcations, chaos, cellular automata, continuous field models, static networks, dynamic networks, and agent-based models. Most of these topics are discussed in two chapters, one focusing on computational modeling and the other on mathematical analysis. This unique approach provides a comprehensive view of related concepts and techniques, and allows readers and instructors to flexibly choose relevant materials based on their objectives and needs. Python sample codes are provided for each modeling example.
- Author:
- Hiroki Sayama, Binghamton University, State University of New York.
Just how small are atoms? Really, really, really small. This fast-paced animation from TED-Ed uses metaphors (imagine a blueberry the size of a football stadium!) to give a visceral sense of just how small atoms are.
- Author:
- Jon Bergmann