Showing posts with label Science. Show all posts
Showing posts with label Science. Show all posts
Waterspout
Dark Matter, an Illusion?
Dark matter is thought to be an invisible substance that makes up almost a quarter of the mass in the universe. The concept was first proposed in 1933 to explain why the outer galaxies in galaxy clusters orbit faster than they should, based on the galaxies' visible mass.
At the observed speeds, the outer galaxies should be flung out into space, since the clusters don't appear to have enough mass to keep the galaxies at their edges gravitationally bound.
So physicists proposed that the galaxies are surrounded by halos of invisible matter. This dark matter provides the extra mass, which in turn creates gravitational fields strong enough to hold the clusters together.
In the new study, physicist Dragan Hajdukovic at the European Organization for Nuclear Research (CERN) in Switzerland proposes an alternative explanation, based on something he calls the "gravitational polarization of the quantum vacuum."
The quantum vacuum is the name physicists give to what we see as empty space.
Scirus
OpenStudy
Like any successful startup, we work hard, have fun, and believe in what we do. We invite you to use us, join us, and spread the word. We want to change the way the world learns, and we'd love to have you be part of it.
OpenStudy is a for profit business funded by the National Science Foundation, the National Institutes of Health, and the Georgia Research Alliance. We're located at Georgia Tech's ATDC Center in Technology Square, Midtown Atlanta. OpenStudy
Halley's Comet
Halley's returns to the inner solar system have been observed and recorded by astronomers since at least 240 BC. Clear records of the comet's appearances were made by Chinese, Babylonian, and medieval European chroniclers, but were not recognized as reappearances of the same object at the time. The comet's periodicity was first determined in 1705 by English astronomer Edmond Halley, after whom it is now named. Halley's Comet last appeared in the inner Solar System in 1986 and will next appear in mid-2061.
During its 1986 apparition, Halley became the first comet to be observed in detail by spacecraft, providing the first observational data on the structure of a comet nucleus and the mechanism of coma and tail formation. These observations supported a number of longstanding hypotheses about comet construction, particularly Fred Whipple's "dirty snowball" model, which correctly surmised that Halley would be composed of a mixture of volatile ices — such as water, carbon dioxide and ammonia — and dust. The missions also provided data which substantially reformed and reconfigured these ideas; for instance it is now understood that Halley's surface is largely composed of dusty, non-volatile materials, and that only a small portion of it is icy. Wikipedia
Hurricane Balls
The 'Hurricane Balls' consist of two ball bearings welded together - no easy task! If you spin the Hurricane Balls on a smooth surface, you can use the plastic pipe to blow at one side of the Hurricane Balls. Not only does this keeps them spinning, you can accelerate them up to incredible speeds. Speeds of 12,000 rpm have been recorded for the Hurricane Balls using a laboratory strobe light.Any smooth surface will work for spinning on, but the very best is a concave mirror, e.g. those round, magnifying bathroom mirrors. We do not supply the mirror, as these are fragile to post, and are readily available everywhere.Once the Hurricane Balls are spinning, you can then use the coloured LED torches to illuminate them, with different colours at different angles. In a darkened room, the effect is magical! grand-illusions.com
Free science documentaries
1.Are We Alone In The Universe | Full Documentary Are We Alone In The Universe a Full 48min. Documentary from the BBC
3.100 Greatest Discoveries Physics Part 1 discusses the history of physics including The Law of Falling Bodies - Newton Law of Gravitation
4.Earthlings - Full length documentary EARTHLINGS is the single most powerful and informative documentary about society's tragic and unforgivable use of nonhuman animals, narrated by Joaquin Phoenix with soundtrack by Moby.
5.BBC -The Illusion of Reality A look at the reality in which we live, and our perceptions of it
6.Fermat's Last Theorem BBC Horizon programme. Simon Singh's moving documentary of Andrew Wiles' extraordinary search for the most elusive proof in number theory
Top 10 ‘Craziest’ Mental Disorders
Throughout history, mental disorders have been regarded with fear, bias, and ignorance. Though medicine has drastically improved for the mentally ill in the last century, mainstream society still has a relatively uninformed and biased view against individuals with mental disorders. This is particularly harmful because every year up to ¼ of Americans fit the criteria for being mentally ill.Note: There are many other disorders, some similar to the disorders mentioned. All information is received from the American Psychiatric Association’s “Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, Text Revision”.
10. Type One Bipolar Disorder
Bipolar disorder has been talked about a lot. It has received vast media coverage and most individuals have at least a general idea of what it is. Bipolar disorder makes an individual switch between two main moods: mania (emotions like happiness and anger) and depression (emotions like sadness and guilt). Unlike the media interpretation, Bipolar disorder’s mood swings actually take a long time. Each swing lasts about a week on average, with a few days’ transition in between. Read more
Twilight phenomenon
The phenomenon typically occurs with launches that take place either 30 to 60 minutes before sunrise or after sunset when a booster rocket or missile rises out of the darkness and into a sunlit area, relative to an observer's perspective on the ground.
This phenomenon usually produces a cloud of green, blue, white and rose colored hues which takes on a corkscrew appearance as it is whipped around by wind currents. It is seen within two to three minutes after a launch has occurred. Depending on weather conditions, it could remain in the sky for up to half an hour before dispersing.
Pre-dawn launches are probably less spectacular than their dusk counterparts. During dusk launches, the sunlight shines through the exhaust plume. Pre-dawn launches, on the other hand, produce a more subtle display because the sunlight directly reflects off the plume.
At Vandenberg AFB in California, more than 1,800 missiles and space boosters have been launched from the central California coastline in northern Santa Barbara County since December 1958. However, only a small percentage of these launches have created the twilight phenomenon. Wikipedia
Your age on other worlds
Looking at the numbers above, you'll immediately notice that you are different ages on the different planets. This brings up the question of how we define the time intervals we measure. What is a day? What is a year?The earth is in motion. Actually, several different motions all at once. There are two that specifically interest us. First, the earth rotates on it's axis, like a spinning top. Second, the earth revolves around the sun, like a tetherball at the end of a string going around the center pole.
The top-like rotation of the earth on its axis is how we define the day. The time it takes the earth to rotate from noon until the next noon we define as one day. We further divide this period of time into 24 hours, each of which is divided into 60 minutes, each of which is broken into 60 seconds. There are no rules that govern the rotation rates of the planets, it all depends on how much "spin" was in the original material that went into forming each one. Giant Jupiter has lots of spin, turning once on its axis every 10 hours, while Venus takes 243 days to spin once.
The revolution of the earth around the sun is how we define the year. A year is the time it takes the earth to make one revolution - a little over 365 days.
We all learn in grade school that the planets move at differing rates around the sun. While earth takes 365 days to make one circuit, the closest planet, Mercury, takes only 88 days. Poor, ponderous, and distant Pluto takes a whopping 248 years for one revolution. Below is a table with the rotation rates and revolution rates of all the planets. Check more
12 Events That Will Change Everything, Made Interactive
1)Polar meltdown
2)Extra dimensions
3) Extraterrestrial intelligence
4)Nuclear exchange
5)Creation of life
6)Room temperature supercontactors
7)Machine self-awareness
8)Cloning of a human
9)Pacific earthquake
10)Fusion energy
11)Asteroid collision
12)Deadly pandemic
article
Bullet proof skin made from spider silk
Well, almost.
BLOG: Artificial Skin Made From Spider Silk
In her new project, 2.6g 329m/s, Dutch artist Jalila Essaidi, along with Forensic Genomics Consortium Netherlands, created a swatch of nearly bulletproof skin made from spider silk and human skin cells. The project takes its name from the maximum weight and velocity a Type 1 bulletproof vest can withstand from a .22 calibre Long Rifle bullet.
DNEWS VIDEO: SYNTHETIC LIFE, ENGINEERING TISSUE AND MORE …
By grafting spider silk between the epidermis and dermis, the skin was able to stop a bullet that was fired at a reduced speed. However, it failed to repel a bullet that was fired at normal speed from a .22 calibre rifle.
But that's fine with Essaidi. She's more interested in the conversation that her project will generate. Discovery.com
EOL Robot Band covers The Beautiful People by Marilyn Manson
Muting the guitar strings was a bitch but if you look at the solenoids on Fret 4 and 8 you will see that I covered the pads with foam and velvet. It is soft enough to stop the strings from vibrating.
Some people have been asking about a keyboard sound, Yes there is one but it had such a small part in the song I did not video tape it. However you can see it in action in my other video "The Bit-52's Rock Lobster"
Zapping the brain improve brains skills
t's barely enough to light a light bulb, but passing a very mild current of electricity through the brain can turn on a metaphorical light bulb in a person's brain.
Scientists from the University of Oxford have shown that they can improve a person's math abilities for up to six months. The research could help treat the nearly 20 percent of the population with moderate to severe dyscalculia (math disability), and could probably aid students in other subjects as well.
"I am certainly not advising people to go around giving themselves electric shocks," said Roi Cohen Kadosh, a scientist at the University of Oxford and a co-author of a new paper. "But we are extremely excited by the potential of our findings." Read more
The Strange Powers of the Placebo Effect - Video
In medical research, placebos are given as control treatments and depend on the use of measured deception. Common placebos are inert tablets, sham surgery, and other procedures based on false information. However, placebos can also have a surprisingly positive effect on a patient who knows that the given treatment is without any active drug, as compared with a control group who knowingly did not get a placebo.
In one common placebo procedure, however, a patient is given an inert pill, told that it may improve his/her condition, but not told that it is in fact inert. Such an intervention may cause the patient to believe the treatment will change his/her condition; and this belief may produce a subjective perception of a therapeutic effect, causing the patient to feel their condition has improved. This phenomenon is known as the placebo effect.
Placebos are widely used in medical research and medicine, and the placebo effect is a pervasive phenomenon; in fact, it is part of the response to any active medical intervention. The placebo effect points to the importance of perception and the brain's role in physical health. However, when used as treatment in clinical medicine (as opposed to laboratory research), the deception involved in the use of placebos creates tension between the Hippocratic Oath and the honesty of the doctor-patient relationship. The United Kingdom Parliamentary Committee on Science and Technology has stated that: "...prescribing placebos... usually relies on some degree of patient deception" and "prescribing pure placebos is bad medicine. Their effect is unreliable and unpredictable and cannot form the sole basis of any treatment on the NHS. Wikipedia
18 Health Tricks to Teach Your Body
Instead, why not train yourself to do something that may actually pay off?
We're not talking bench presses and interval training (though those do help). You can teach your body to cure itself from everyday health ailments—side stitches, first-date jitters, even hands that have fallen asleep.
Just study this list, and the next time your friends challenge you to an ice cream eating contest, chow down: You know how to thaw a brain freeze—and 17 other tricks that'll make everyone think you're the next David Blaine. But without all that "hold your breath for 17 minutes" mess.
Cure a Tickling Throat
When you were 9, playing your armpit was a cool trick. Now, as an adult, you can still appreciate a good body-based feat, especially if it serves as a health remedy. Take that tickle in your throat: It's not worth gagging over. Here's a better way to scratch your itch: Scratch your ear. "When the nerves in the ear are stimulated, it creates a reflex in the throat that can cause a muscle spasm," says Scott Schaffer, M.D., president of an ear, nose, and throat specialty center in Gibbsboro, New Jersey. "This spasm relieves the tickle."
Experience Supersonic Hearing
If you're stuck chatting up a mumbler at a cocktail party, lean in with your right ear. It's better than your left at following the rapid rhythms of speech, according to researchers at the UCLA David Geffen School of Medicine. If, on the other hand, you're trying to identify that song playing softly in the elevator, turn your left ear toward the sound. The left ear is better at picking up music tones. menshealth.com
Autistic boy,12, with higher IQ than Einstein develops his own theory of relativity
A 12-year-old child prodigy has astounded university professors after grappling with some of the most advanced concepts in mathematics.
Jacob Barnett has an IQ of 170 – higher than Albert Einstein – and is now so far advanced in his Indiana university studies that professors are lining him up for a PHD research role.
The boy wonder, who taught himself calculus, algebra, geometry and trigonometry in a week, is now tutoring fellow college classmates after hours.
And now Jake has embarked on his most ambitious project yet – his own ‘expanded version of Einstein’s theory of relativity’.
His mother, not sure if her child was talking nonsense or genius, sent a video of his theory to the renowned Institute for Advanced Study near Princeton University.
According to the Indiana Star, Institute astrophysics professor Scott Tremaine -himself a world renowned expert – confirmed the authenticity of Jake’s theory.
In an email to the family, Tremaine wrote: ‘I’m impressed by his interest in physics and the amount that he has learned so far.
‘The theory that he’s working on involves several of the toughest problems in astrophysics and theoretical physics.
‘Anyone who solves these will be in line for a Nobel Prize.’ theautismnews.com
3D printer
3D printing is a form of additive manufacturing technology where a three dimensional object is created by laying down successive layers of material. 3D printers are generally faster, more affordable and easier to use than other additive manufacturing technologies. 3D printers offer product developers the ability to print parts and assemblies made of several materials with different mechanical and physical properties in a single build process. Advanced 3D printing technologies yield models that can serve as product prototypes.Top 10 Strange Phenomena of the Mind
The mind is a wonderful thing – there is so much about it which remains a mystery to this day. Science is able to describe strange phenomena, but can not account for their origins. While most of us are familiar with one or two on this list, many others are mostly unknown outside of the psychological realm. This is a list of the top ten strange mental phenomena.
We have all some experience of a feeling, that comes over us occasionally, of what we are saying and doing having been said and done before, in a remote time – of our having been surrounded, dim ages ago, by the same faces, objects, and circumstances – of our knowing perfectly what will be said next, as if we suddenly remember it! – Charles Dickens
10. Déjà vécu (pronounced vay-koo) is what most people are experiencing when they think they are experiencing deja vu. Déjà vu is the sense of having seen something before, whereas déjà vécu is the experience of having seen an event before, but in great detail – such as recognizing smells and sounds. This is also usually accompanied by a very strong feeling of knowing what is going to come next. In my own experience of this, I have not only known what was going to come next, but have been able to tell those around me what is going to come next – and I am right. This is a very eerie and unexplainable sensation.Read more
Awesome Videos of Humanoid Robots Imitating Humans
A humanoid robot is an autonomous robot, because it can adapt to changes in its environment or itself and continue to reach its goal. This is the main difference between humanoid and other kinds of robots. Some of the capacities of a humanoid robot may include self-maintenance, autonomous learning, avoiding harmful situations to people, property, and itself and safe interaction with human beings and the environment. ibtimes.com
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