The mathematical secrets of Pascal’s triangle - Wajdi Mohamed Ratemi. The Three Square Geometry Problem - Numberphile. The Spooky Nature of Electromagnetic Radiation. Our story begins a little over one hundred years ago in Bern, Switzerland, where a young man employed as a patent clerk went off to work.
He took the electric trolley in each day, and each day he would pass an unassuming clock tower. But today was different, it was special. For today he would pose to himself a question – a question whose answer would set forth a fascinating dilemma. The hands of the clock appeared to move the same no matter if his trolley was stopped or was speeding away from the clock tower. He knew that the electromagnetic radiation which enabled him to see the clock traveled at a finite speed.
There was no way for him to know that it would take three years to answer this question. Now it might have taken Einstein a few years to develop the answer we now know as the Special Theory of Relativity, but it most certainly took him no longer than a few days to realize that Issac Newton… must be wrong. 600 Free eBooks for iPad, Kindle & Other Devices.
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Wobbly Circles - Numberphile. Ultra slow motion, błyskawica w 11000 fps. Primal Chaos. Course: The Open Science Laboratory. The International Date Line, Explained. Dan Heim taught physics and mathematics for 30 years — more if you count his grade-school science club.
Since 1999, he's been a freelance writer and creates educational computer graphics and animations. Dan is President of the Desert Foothills Astronomy Club in New River, Ariz. His weekly blog Sky Lights covers topics including astronomy, meteorology, and earth science, and questions from readers are encouraged. We all heard about the International Date Line (IDL) in geography class — it was this special line on the globe where the day and date change. Where Time Comes From. Stock footage of Newsreel story: In Selma, Alabama, General James W Moore, of the Confederate Army dies at 99. DVArchive Clip ID 000-5383. Royalty free stock footage, video, and movie clips - 000-5383.jpg. About Public Domain Clip Prices Some commercial libraries charge license fees for clips in the Public Domain.
DVArchive believes it is more in keeping with the spirit and intent of PD to offer these clips for free to the public with only a modest handling fee to cover our expenses in preparing, resizing, transferring or improving the clips for download and making them available to you. Our handling fees are as follows: $35 for clips under 30 seconds $45 for clips from :30 to 1:00 $55 for clips 1-2 minutes $65 for clips over 2 minutes About the Public Domain Copyright DVarchive has taken reasonable steps to verify the copyright status of this work or clip and has determined that it is most likely in the public domain, and can be freely used and re-used in projects at your discretion. FLP Vol. I Table of Contents. Free books: 100 legal sites to download literature.
The Classics Browse works by Mark Twain, Joseph Conrad and other famous authors here.
Classic Bookshelf: This site has put classic novels online, from Charles Dickens to Charlotte Bronte.The Online Books Page: The University of Pennsylvania hosts this book search and database.Project Gutenberg: This famous site has over 27,000 free books online.Page by Page Books: Find books by Sir Arthur Conan Doyle and H.G. Wells, as well as speeches from George W. Bush on this site.Classic Book Library: Genres here include historical fiction, history, science fiction, mystery, romance and children’s literature, but they’re all classics.Classic Reader: Here you can read Shakespeare, young adult fiction and more.Read Print: From George Orwell to Alexandre Dumas to George Eliot to Charles Darwin, this online library is stocked with the best classics.Planet eBook: Download free classic literature titles here, from Dostoevsky to D.H. Textbooks Math and Science Children’s Books Philosophy and Religion. A new way to learn. Roots. Typesetting math: 8% John Baez December 15, 2011 Around 2006, my friend Dan Christensen created a fascinating picture of all the roots of all polynomials of degree ≤ 5 with integer coefficients ranging from -4 to 4: Click on the picture for bigger view.
Roots of quadratic polynomials are in grey; roots of cubics are in cyan; roots of quartics are in red and roots of quintics are in black. World Clock. Top 6 Open Source Back-to-School Apps: A SourceForge Downloader’s Guide. List of Free Science Books. The Hardest Thing To Find In The Universe? : Krulwich Wonders... Archives and Libraries.
Pauls Online Math Notes. Relatively Prime. Benford's Law. If you’ve not heard about Benford’s Law before, you’re in for a real treat with this post.
Before we get into the theory, however, indulge with me in a little thought experiment. (Gedanken) Gedanken Experiment Actual results Huh !!? Curiouser and curiouser! But wait, there’s more … It gets even more puzzling. Instead of plotting the chart based on altitude measured in feet, let’s say I convert all the altitudes into Meters (I like the Metric system), and plot the chart again. Nope! If we recreate the chart, yet again, but this time using the height data converted into the ancient unit of measure the Royal Egyptian Cubit, we get a similar shaped distribution (One Royal Egyptian Cubit = 523 mm). In fact, it does not matter which units I plot the data in (meaning it does not matter what arbitrary scale conversion factor I apply), the distribution of the leading digit follows a similar curve.
Something is clearly going on here. Lectures. Online Etymology Dictionary. Welcome Board.