Discover the world's most endangered species Wildscreen's Arkive project was launched in 2003 and grew to become the world's biggest encyclopaedia of life on Earth. With the help of over 7,000 of the world’s best wildlife filmmakers and photographers, conservationists and scientists, Arkive.org featured multi-media fact-files for more than 16,000 endangered species. Freely accessible to everyone, over half a million people every month, from over 200 countries, used Arkive to learn and discover the wonders of the natural world. Since 2013 Wildscreen was unable to raise sufficient funds from trusts, foundations, corporates and individual donors to support the year-round costs of keeping Arkive online. Therefore, the charity had been using its reserves to keep the project online and was unable to fund any dedicated staff to maintain Arkive, let alone future-proof it, for over half a decade. Therefore, a very hard decision was made to take the www.arkive.org website offline in February 2019.
Periodic Table of Elements and Chemistry Origin of the Chemical Elements During the process of stellar evolution nuclear fusion reactions take place within a star. These give rise to the formation of the chemical elements. Clues to the processes involved may be deduced from the graph below, which shows the cosmic abundances of elements (y-axis) plotted against atomic number (x-axis). The abundances are measured relative to 1 million silicon atoms and the y-axis is a logarithmic scale. There are three important observations to be made from this graph: The graph has (overall) a smooth trend from left to right, that is from light to heavy elements. It is thought that the early Universe consisted almost entirely of the element hydrogen, with a small amount of helium present too. Early in star development hydrogen is utilised to manufacture the element helium. Elements heavier than iron are formed by the addition of neutrons which are absorbed by the atomic nucleus. You may wish to follow up this section with visits to the following sites:
Games@NOAA The Periodic Table . It's Elementary... for a Mad Scientist At the end of the last chapter, we discussed what changing the number of protons in an atom does to the element. Surprise, you have a different element altogether! Now we are going to look at changing the number of electrons to match the number of protons in the atom. After all, there has to be the same number of negative charges as positive charges or the atom will not be neutral. Before we get into electrons, look at your Periodic Table of the Elements. The table has the elements organized into columns and rows. But how do energy levels relate to the Periodic Table? Sustainability & Endangered Elements | Chemistry Description of Contents I. "Rare Earths: Resource Sustainability". Abstract of an article to be published in The Rare Earth Elements: Fundmentals and Applications (October 2012). II. To obtain a copy of the Endangered Elements Periodic Table (shown below) and to get more information on this subject see: III. A. B. C. IV. I. Chapter in The Rare Earth Elements: Fundamentals and Applications, October 2012 David A. Abstract Rare earth elements have unique electronic, optical, luminescent, and magnetic properties that make them critically important in a broad range of products and applications. Keywords: Sustainability, Strategic Elements, Endangered Elements Article Contents: II.
Wildlife & Nature Videos | Clips | Photos | Programmes - itvWILD NASA eClips™ NASA eClips™ are short, relevant educational video segments. These videos inspire and engage students, helping them see real world connections. Full Site Located: Grades K‑5 The Our World program supplements existing elementary learning objectives not only in science, technology, engineering and mathematics, but also in reading, writing, and visual and performing arts. Grades 6‑8 Real World video segments connect classroom mathematics to 21st century careers and innovations and are designed for students to develop an appreciation for mathematics through real-world problem-solving. Grades 9‑12 Launchpad video segments support project-based and problem-based learning experiences in science, mathematics, and career and technical education classrooms. General Public The NASA 360 thirty-minute magazine style program highlights NASA's impact on daily lives, showcasing some of the 30,000 inventions developed by NASA over the past 50 years.
History of Newton's Papers (1727-1872) | Newton Project At his death on 20 March 1727,[1] Isaac Newton left papers relating to all areas of the intellectual pursuits he had followed since arriving at Trinity College, Cambridge, in the summer of 1661.[2] His friend, relative by marriage (to Newton's half-niece Catherine Barton) and successor at the Mint, John Conduitt, posted a bond for Newton's debts and claimed entitlement to this material, Newton having died intestate. As is evident from a number of manuscripts adorned with Conduitt's notes and corrections -- for example the manuscript of 'An historical account of two notable corruptions of Scripture in a Letter to a Friend' (now New College, Oxford, Ms. 361.4) -- he took a serious scholarly interest in the papers he had acquired, although this was also partly directed towards the possibility of their publication. Continue reading about the donation of Newton's scientific papers to Cambridge University in 1872 [12] S. [14] J. [15] D. [16] F.
Extreme Weather 2011 A year for the record books From extreme drought, heat waves and floods to unprecedented tornado outbreaks, hurricanes, wildfires and winter storms, a record 14 weather and climate disasters in 2011 each caused $1 billion or more in damages — and most regrettably, loss of human lives and property. NOAA's National Weather Service has redoubled its efforts to create a "Weather-Ready Nation", where vulnerable communities are better prepared for extreme weather and other natural disasters. NOAA forecasts, advisories, watches, warnings and community-based preparedness programs have been and will continue play an even greater role in enhancing the economy and saving lives. A Weather-Ready Nation is one in which businesses, governments and the public are armed with accurate forecasts and other critical information on which to make smart decisions to protect life and property when severe weather threatens. Get historical and current billion-dollar disaster information from NOAA's NCDC »