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Around a black hole 12 billion light years away, there's an almost unimaginable vapor cloud of water--enough to supply an entire planet's worth of water for every person on earth, 20,000 times over. Researchers found a lake of water so large that it could provide each person on Earth an entire planet’s worth of water--20,000 times over. Yes, so much water out there in space that it could supply each one of us all the water on Earth--Niagara Falls, the Pacific Ocean, the polar ice caps, the puddle in the bottom of the canoe you forgot to flip over--20,000 times over.
Almost everyone reading the articles on this site will have spare computers languishing about. The rapid growth and improvements in hardware means that we cycle through a whole machine in only a few years. If you have spare machines and parts languishing about, you can put them to good use! In this article I have outlined some of the purposes your old hardware can serve. There are so many reasons to have a personal server. I use mine for my media, so I can easily stream music and video around my house.
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This is a list of notable idioms in the English language . An idiom is a common word or phrase with a culturally understood meaning that differs from what its composite words' denotations would suggest. For example, an American-English speaker would understand the phrase "kick the bucket" to mean "to die," as well as to actually kick a bucket. Furthermore, they would understand when each meaning is being used in context.
From law-violating subatomic particles to entirely new, earth-like worlds, 2011 was an incredible year for scientific discovery. In the past 12 months, scientific breakthroughs in fields ranging from archaeology to structural biochemistry have allowed humanity to rewrite history, and enabled us to open to brand new chapters in our development as a species. The world's lowest density material With a density of less than one milligram per cubic centimeter (that's about 1000 times less dense than water), this surprisingly squishy material is so light-weight, it can rest on the seed heads of a dandelion, and is lighter than even the lowest-density aerogels .
There is something special about the tricks and tips people come up with to turn old or useless objects into something fresh and useful. Turning an old gadget or piece of furniture into something completely new is a great way to extend its life, and here are some of our favorite conversions from the last year. With the rapid progression of technology each year, it's easy to accumulate a pile of obsolete gadgets that you just can't bear to get rid of. Here's a few of the best ways you can still get use out of those gadgets and repurpose a pile of what might otherwise end up in the landfill.
If you've ever been convinced by a salesperson that you truly wanted a product, done something too instinctively, or made choices that seemed entirely out of character, then you've had an idea planted in your mind. Here's how it's done. Before we get started, it's worth noting that planting an idea in someone's mind without them knowing is a form of manipulation. We're not here to judge you, but this is the sort of thing most people consider evil , so you probably shouldn't actually do anything you read here.
We have been increasingly using Flash animations for illustrating Physics content. This page provides access to those animations which may be of general interest. The animations will appear in a separate window.
DAD: That is an EXCELLENT question. Soap is a surfactant because it forms water-soluble micelles that trap the otherwise insoluble dirt and oil particles. DAD: Because while carbon and hydrogen have almost the same electronegativity, oxygen is far more electronegative, thereby polarizing the C-O bonds. DAD: Why is oxygen more electronegative than carbon and hydrogen?
Three Lectures by Hans Bethe IN 1999, legendary theoretical physicist Hans Bethe delivered three lectures on quantum theory to his neighbors at the Kendal of Ithaca retirement community (near Cornell University). Given by Professor Bethe at age 93, the lectures are presented here as QuickTime videos synchronized with slides of his talking points and archival material. Intended for an audience of Professor Bethe's neighbors at Kendal, the lectures hold appeal for experts and non-experts alike. The presentation makes use of limited mathematics while focusing on the personal and historical perspectives of one of the principal architects of quantum theory whose career in physics spans 75 years. A video introduction and appreciation are provided by Professor Silvan S.