CH210: Age of the Earth. Primordial weirdness: Did the early universe have one dimension? Scientists outline test for theory. That's the mind-boggling concept at the heart of a theory that University at Buffalo physicist Dejan Stojkovic and colleagues proposed in 2010. They suggested that the early universe -- which exploded from a single point and was very, very small at first -- was one-dimensional (like a straight line) before expanding to include two dimensions (like a plane) and then three (like the world in which we live today). The theory, if valid, would address important problems in particle physics. Now, in a new paper in Physical Review Letters, Stojkovic and Loyola Marymount University physicist Jonas Mureika describe a test that could prove or disprove the "vanishing dimensions" hypothesis.
Because it takes time for light and other waves to travel to Earth, telescopes peering out into space can, essentially, look back into time as they probe the universe's outer reaches. Gravitational waves can't exist in one- or two-dimensional space. Universe Sandbox | about.
Interactive 3D model of Solar System Planets and Night Sky. WIKISKY.ORG. The end of the net as we know it | Broadband | Features. Posted on 21 Jan 2011 at 13:34 ISPs are threatening to cripple websites that don't pay them first. Barry Collins fears a disastrous end to net neutrality You flip open your laptop, click on the BBC iPlayer bookmark and press Play on the latest episode of QI. But instead of that tedious, plinky-plonky theme tune droning out of your laptop’s speakers, you’re left staring at the whirring, circular icon as the video buffers and buffers and buffers...
That’s odd. Not only have you got a new 40Mbits/sec fibre broadband connection, but you were watching a Full HD video on Sky Player just moments ago. Net neutrality? The free, unrestricted internet as we know it is under threat. No such thing as net neutrality It’s worth pointing out that the concept of net neutrality – ISPs treating different types of internet traffic or content equally – is already a busted flush. “We have an unbelievably good, differentiated network at all levels, with huge levels of widespread discrimination of traffic types.
Welcome - Synergy. Audio Highs. Chronology of Events in Science, Mathematics, and Technology. Graphene Will Change the Way We Live | Dr. Kaku's Universe. The theory behind the substance graphene was first explored by theoretical physicist Philip Wallace in 1947 as kind of a starting point when he was doing research trying to understand the electronic properties of more complex, 3D graphite. although the name graphene wasn't actually coined until 40 years later, where it was used to describe single sheets of graphite. In other words, it's the name given to a flat monolayer of carbon atoms that are tightly packed into a 2D honeycomb lattice; like a molecular chicken-wire that is one atom thick. It's essentially the basic building block for graphitic materials of all other dimensionalities; it's a stepping stone to building bigger things.
Graphene in itself however wasn't discovered until 2004 in its full observable and testable form. Since then, in the past 6 years, scientists have discovered that the substance retains some amazing properties.
Physics. Internet. Open Mesh Project - Don't let governments shut down the Internet. Eben Moglen Is Reshaping Internet With a Freedom Box. Designbuzz: Design trendsetter. Life & Arts - The Ten Things Everyone Should Know About Science. World of Ends - what the internet is. Educated Earth // Science Videos, Images, News. Earth View. Canister lets you add water (or bodily fluids) to recharge batteries. SiGNa Chemistry Inc. is launching a hydrogen-producing cartridge, the mobile-H2™, that will work with a portable, pocket-sized fuel cell charger to provide instant power for cell phones and other mobile devices. You simply add water to the cartridge, and the device will charge depleted batteries on the go. For further convenience, any water will do (even waste water). Unlike solar battery chargers, you don’t need to worry about getting enough sunlight.
According to its press materials, these cartridges provide a steady level of power from beginning to end. This sounds a bit like magic, but it actually involves some well-known chemistry. SiGNa hasn’t released details on the synthesis of their sodium silicide. SiGNa’s sodium silicide might have a similar production process. When SiGNa’s sodium silicide meets water, it immediately produces low-pressure hydrogen gas (H2). The fuel cell devices are reusable, but the hydrogen-producing cartridges are not. Ars: Are the cartridges recyclable? The Register. Are You Living in a Computer Simulation? Watch this 3D printer make a tiny Gothic cathedral – New Tech Gadgets & Electronic Devices.
Brief Answers to Cosmic Questions. Structure of the Universe Does the Universe have an edge, beyond which there is nothing? Are the galaxies arranged on the surface of a sphere? Why can't we see the whole universe? Does the term "universe" refer to space, or to the matter in it, or to both? Evolution of the Universe Did the Universe expand from a point? If so, doesn't the universe have to have an edge?
More about the Big Bang When they say "the universe is expanding," what exactly is expanding? Structure of the Universe Does the Universe have an edge, beyond which there is nothing? Are the galaxies arranged on the surface of a sphere? Why can't we see the whole universe? If you could suddenly freeze time everywhere in the universe, and magically survey all of creation, you would find galaxies extending out far beyond what we can see today.
Does the term "universe" refer to space, or to the matter in it, or to both? Today, the situation is reversed. Evolution of the Universe Did the Universe expand from a point? The Measurement of Science. Albert Einstein’s greatest scientific “blunder” (his word) came as a sequel to his greatest scientific achievement. That achievement was his theory of gravity, the general theory of relativity, which he introduced in 1915. Two years later, in 1917, Einstein ran into a problem while trying to apply general relativity to the Universe as a whole. At the time, Einstein believed that on large scales the Universe is static and unchanging. But he realized that general relativity predicts that such a Universe can’t exist: it would spontaneously collapse in on itself. To solve this problem, Einstein modified the equations of general relativity, adding an extra term involving what is called the “cosmological constant” , which, roughly speaking, is a type of pressure which keeps a static Universe from collapsing.
Twelve years later, in 1929, Edwin Hubble discovered that the Universe isn’t static and unchanging, but is actually expanding. The story doesn’t end there. One metric to rule them all. No, really, pi is wrong: The Tau Manifesto by Michael Hartl | Tau Day, 2010. 40 technologies to watch in 2011. If the popular misreading of Mayan mythology is correct, we have fewer than two more years left on this Earth.
That leaves precious little time for the tech industry to develop and perfect of all the cool technologies that sci-fi authors have dreamed up over the years. Still, while a December 2012 apocalypse may spell doom for the commercial viability of hovercars, it doesn't mean that the next couple of years in tech will be dull — quite the contrary. 2011 is already shaping up to be a banner year for tech and web innovation. Below is a list of over 40 websites, apps, companies, gadgets and technologies that the editors of Mashable think that you should keep an eye on over the coming year. None of them let you zoom through the air over traffic, but they're definitely all worth a look. Be sure to click through to each article to see our full write ups on individual entries, and let us know in the comments what you're looking out for in 2011. 10 Websites to Watch 10 Apps to Watch. MakeUseOf.
Microscope photos. These microscope pictures are taken from the book ‘ Microcosmos’, created by Brandon Brill . This book includes many scanning electron microscope (SEM) images of insects, human body parts and household items. These are the most amazing images of what is too small to see with the naked eye. 01 – A wood or heathland Ant, Formica fusca, holding a microchip 02 – The surface of an Erasable Programmable Read-Only Memory silicon microchip 03 – Eyelash hairs growing from the surface of human skin 04 – The surface of a strawberry 05 – Bacteria on the surface of a human tongue 06 – Human sperm (spermatozoa), the male sex cells 07 – The nylon hooks and loops of velcro 08 – Household dust which includes long hairs such as cat fur, twisted synthetic and woolen fibers, serrated insect scales, a pollen grain, plant and insect remains 09 -The weave of a nylon stocking 10 – The end of the tongue (proboscis) of a hummingbird hawkmoth 11 – The head of a mosquito 12 – A human head louse clinging to a hair.