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Howro. What is Calcium Carbonate? - Industrial Minerals Association - North America. Calcium carbonate, or CaCO3, comprises more than 4% of the earth’s crust and is found throughout the world. Its most common natural forms are chalk, limestone, and marble, produced by the sedimentation of the shells of small fossilized snails, shellfish, and coral over millions of years. Although all three forms are identical in chemical terms, they differ in many other respects, including purity, whiteness, thickness and homogeneity. Calcium carbonate is one of the most useful and versatile materials known to man.

Many of us encounter calcium carbonate for the first time in the school classroom, where we use blackboard chalk. Chalk has been used as a writing tool for over 10,000 years and is a fine, microcrystalline material. As limestone, calcium carbonate is a biogenic rock, and is more compacted than chalk. Calcium carbonate, as it is used for industrial purposes, is extracted by mining or quarrying. Calcium carbonate causes a unique reaction with acids. What is Calcium Carbonate? - Industrial Minerals Association - North America. NYPL Digital Collections. 32,000+ Bauhaus Art Objects Made Available Online by Harvard Museum Website.

You may have first encountered the word Bauhaus as the name of a campy, arty post-punk band that influenced goth music and fashion. But you'll also know that the band took its name from an even more influential art movement begun in Germany in 1919 by Walter Gropius. The appropriation makes sense; like the band, Bauhaus artists often leaned toward camp---see, for example, their costume parties---and despite their serious commitment, had a sense of humor about their endeavor to radically alter European art and design. But the Bauhaus movement has been unfairly pegged at times as overly serious: cold technologists and proponents of faceless glass and steel buildings and austere modernist furniture.

That impression only tells a part of the tale. When we speak of Bauhaus design, we often forget that the Bauhaus was also—and first principally—an art school. These names are represented in the Harvard collection, but so are “different facets of the Bauhaus and its legacy.” Related Content: 2,200 Radical Political Posters Digitized: A New Archive. I recently heard someone say his college-bound nephew asked him, "What's a union? " Whether you love unions, loathe them, or remain indifferent, the fact that an ostensibly educated young person might have such a significant gap in their knowledge should cause concern. A historic labor conflict, after all, provided the occasion for Ronald Reagan to prove his bona fides to the new conservative movement that swept him into power.

His crushing of the Professional Air Traffic Controllers Organization (PATCO) in 1981 set the tone for the ensuing 30 years or so of economic policy, with the labor movement fighting an uphill battle all the way. Prior to that defining event, unions held sway over politics local and national, and had consolidated power blocks in the American political landscape through decades of struggle against oppressive and dehumanizing working conditions. via Hyperallergic (where you can find some other big, visually striking posters) Related Content: Free for All: NYPL Enhances Public Domain Collections For Sharing and Reuse | The New York Public Library. Today we are proud to announce that out-of-copyright materials in NYPL Digital Collections are now available as high-resolution downloads.

No permission required, no hoops to jump through: just go forth and reuse! The release of more than 180,000 digitized items represents both a simplification and an enhancement of digital access to a trove of unique and rare materials: a removal of administration fees and processes from public domain content, and also improvements to interfaces — popular and technical — to the digital assets themselves. Online users of the NYPL Digital Collections website will find more prominent download links and filters highlighting restriction-free content; while more technically inclined users will also benefit from updates to the Digital Collections API enabling bulk use and analysis, as well as data exports and utilities posted to NYPL's GitHub account.

We've made it easier than ever to search, browse, and download public domain items in Digital Collections. Search Engines. Digital Inspiration - Howto Guides & Software Tutorials. Learn the Wget Command with 20 Practical Examples. Wget lets you download Internet files or even mirror entire websites for offline viewing. Here are 20 practical examples for using the wget command. How do I download an entire website for offline viewing? How do I save all the MP3s from a website to a folder on my computer? How do I download files that are behind a login page? How do I build a mini-version of Google? Wget is a free utility – available for Mac, Windows and Linux (included) – that can help you accomplish all this and more. Mirror an entire website with wget Wget is extremely powerful, but like with most other command line programs, the plethora of options it supports can be intimidating to new users. 1. 2. 3. 4. 5. 6. 7. 8.

Mirror websites with Wget 9. 10. 11. 12. 13. Wget for Downloading Restricted Content Wget can be used for downloading content from sites that are behind a login screen or ones that check for the HTTP referer and the User Agent strings of the bot to prevent screen scraping. 14. 15. 16. 17. 18. 19. 20. Comprehensive list of Search Engines - The Search Engine List.

100 Websites You Should Know and Use (updated!) - StumbleUpon - Nightly. Entertainment Meet David Peterson, who developed Dothraki for Game of Thrones There are seven different words in Dothraki for striking another person with a sword. Among them: “hlizifikh,” a wild but powerful strike; “hrakkarikh,”a quick and accurate strike; and “gezrikh,” a fake-out or decoy strike. But you won’t find these words in George R. R. Martin’s epic series A Song of Ice and Fire, which is where Dothraki originated as the language […] Culture My Year of TED: How 54 talks changed a life By Kylie Dunn What do you get when you cross a 39-year-old perfectionist with 54 TED Talks and far more honesty than any person probably needs to experience?

Entertainment Meet David Peterson, who developed Dothraki for Game of Thrones There are seven different words in Dothraki for striking another person with a sword. Culture My Year of TED: How 54 talks changed a life. The 101 Most Useful Websites on the Internet. Here are the most useful websites on the Internet that will make you smarter, increase productivity and help you learn new skills. These incredibly useful websites solve at least one problem really well. And they all have cool URLs that are easy to memorize thus saving you a trip to Google.

Also see: The Best Android Apps Also see: The Best Mac Apps and Utilities seatguru.com – consult this site before choosing a seat for your next flight.webmakerapp.com — an offline playground for building web projects in HTML, CSS and JavaScript. Also see: glitch.com.flightstats.com – Track flight status at airports worldwide.mymaps.google.com – create custom Google Maps with scribbles, pins and custom shapes.snopes.com – find if that email offer you received is real or just another scam.typingweb.com – master touch-typing with these practice sessions.todo.microsoft.com — a beautiful todo app and task manager. See: The Most Useful Tools for Programmers Also see: The Best Websites to Learn Coding.