The debate is essentially over and the final word is in: vaccines do not cause autism. The results of a rigorous study conducted over several years were just announced and they confirmed the results of several past studies.
Basically, the final two groups that were studied consisted of 256 children with ASD [autism spectrum disorders] and 752 matched controls. One very interesting aspect that looks as though it were almost certainly placed into the experimental design based on concerns of anti-vaccine advocates like Sallie Bernard is a group of children who underwent regression. Basically, the study examined whether there was a correlation between ASD and TCV [thimerosal-containing vaccines, i.e. mercury-containing vaccines] exposure. It also examined two subsets of ASD, autistic disorder (AD) and ASD with regression, looking for any indication whether TCVs were associated with any of them. Regression was defined as:
“the subset of case-children with ASD who reported loss of previously acquired language skills after acquisition.”
Also, when adding up total thimerosal exposure, the investigators also included any thimerosal exposure that might have come prenatally from maternal receipt of flu vaccines during pregnancy, as well as immunoglobulins, tetanus toxoids, and diphtheria-tetanus. In other words, investigators tried to factor in all the various ideas for how TCVs might contribute to autism when designing this study.
So what did the investigators find? I think you probably know the answer to that question. They found nothing. Nada. Zip. There wasn’t even a hint of a correlation between TCV exposure and either ASD, AD, or ASD with regression:
“There were no findings of increased risk for any of the 3 ASD outcomes. The adjusted odds ratios (95% confidence intervals) for ASD associated with a 2-SD increase in ethylmercury exposure were 1.12 (0.83-1.51) for prenatal exposure, 0.88 (0.62-1.26) for exposure from birth to 1 month, 0.60 (0.36-0.99) for exposure from birth to 7 months, and 0.60 (0.32- 0.97) for exposure from birth to 20 months.”
The last result is a bit of an anomaly in that it implies that exposure to TCVs from birth to 1 month and birth to 7 months actually protects against ASD. The authors quite rightly comment on this result thusly:
“In the covariate adjusted models, we found that an increase in ethylmercury exposure in 2 of the 4 exposure time periods evaluated was associated with decreased risk of each of the 3 ASD outcomes. We are not aware of a biological mechanism that would lead to this result.”
So get your kids (and yourselves) vaccinated and save them & their playmates from this whooping cough bullshit, which is actually killing actual kids and not, you know, magically infecting them with autism. Vaccination is one of the greatest human discoveries ever — yes, Kanye, OF ALL TIME — has saved countless lives, and has made countless more lives significantly better. So: Buck. Up.
In The Grand Design we explain why, according to quantum theory, the cosmos does not have just a single existence, or history, but rather that every possible history of the universe exists simultaneously. We question the conventional concept of reality, posing instead a “model-dependent” theory of reality. We discuss how the laws of our particular universe are extraordinarily finely tuned so as to allow for our existence, and show why quantum theory predicts the multiverse—the idea that ours is just one of many universes that appeared spontaneously out of nothing, each with different laws of nature. And we assess M-Theory, an explanation of the laws governing the multiverse, and the only viable candidate for a complete “theory of everything.”
Why are long free kicks suprisingly effective in soccer matches? Science explains!
For a well-struck soccer ball, the researchers estimate, one might expect a gentle arc followed by a sharp hook at about 50 meters — in rough agreement with the distance of Roberto Carlos’s free kick. In other words, if a soccer player has the strength to drive a ball halfway down the field with plenty of velocity and spin, he or she can expect to benefit from an unexpected curve late in the ball’s trajectory.
But really, this is just an excuse to show you Roberto Carlos’ amazing free kick against France in 1997:
Pure awesometown. But it might not be even be better than this one:
Newton said the speed of gravity is infinite but according to Einstein (and some nifty interstellar measurements), it most certainly is not.
But in general relativity, things are much more intricate, and incredibly interesting. First off, it isn’t mass, per se, that causes gravity. Rather, all forms of energy (including mass) affect the curvature of space. So for the Sun and the Earth, the incredibly large mass of the Sun dominates the curvature of space, and the Earth travels in an orbit along that curved space.
If you simply took the Sun away, space would go back to being flat, but it wouldn’t do so right away at every point. In fact, just like the surface of a pond when you drop something into it, it snaps back to being flat, and the disturbances send ripples outward!
A year later, Obama’s appointment of Collins seemed an inspired choice. The President had found not only a man who reflected his own view of the harmony between science and faith but an evangelical Christian who hoped that the government’s expansion of embryonic-stem-cell research might bring the culture war over science to a quiet end. On August 23rd, however, Judge Royce C. Lamberth, of the Federal District Court for the District of Columbia, halted federal spending for embryonic-stem-cell research, putting hundreds of research projects in limbo and plunging the N.I.H. back into a newly contentious national debate.
On Dec 13, 2006, the sun itself provided a crucial clue, when a solar flare sent a stream of particles and radiation toward Earth. Purdue nuclear engineer Jere Jenkins, while measuring the decay rate of manganese-54, a short-lived isotope used in medical diagnostics, noticed that the rate dropped slightly during the flare, a decrease that started about a day and a half before the flare.
If this apparent relationship between flares and decay rates proves true, it could lead to a method of predicting solar flares prior to their occurrence, which could help prevent damage to satellites and electric grids, as well as save the lives of astronauts in space.
The decay-rate aberrations that Jenkins noticed occurred during the middle of the night in Indiana — meaning that something produced by the sun had traveled all the way through the Earth to reach Jenkins’ detectors. What could the flare send forth that could have such an effect?
Jenkins and Fischbach guessed that the culprits in this bit of decay-rate mischief were probably solar neutrinos, the almost massless particles famous for flying at nearly the speed of light through the physical world — humans, rocks, oceans or planets — with virtually no interaction with anything.
Maybe the science part of 2012 wasn’t so far-fetched after all. (No, not really.)
The beer-like way of serving champagne was found to impact its concentration of dissolved CO2 significantly less. Moreover, the higher the champagne temperature is, the higher its loss of dissolved CO2 during the pouring process, which finally constitutes the first analytical proof that low temperatures prolong the drink’s chill and helps it to retain its effervescence during the pouring process.
If you are filming a Girls Gone Wild video or are in the late stages of a wedding reception, pouring champagne directly into a person’s mouth is also an effective bubble-preservation technique. (via @matthiasrascher)
Is there a word for a scientific fact that is accepted, only to be proven false some years later? Pluto Brontosaurus
and now Triceratops
I’m sure there are more of these, vagaries of science we learned as children ripped cruelly from our pathways in an effort to embarrass us in front of our children (well, your children, mine are imaginary). Let’s make a list? Hit me with an @reply if you know of something that should be on this list.
Update:
This post didn’t quite come out the way I wanted. The triceratops was only momentarily in danger as scientists decided to do away with the Torosaurus instead. Also, Jason wrote a post about a similar topic a couple months ago. Mesofacts are the name for facts that change slowly over time. It’s an important distinction, though, that these ‘facts’, Pluto and Brontosaurus, at least, were ripped away suddenly, instead of changing slowly over time. The only Twitter suggestion I thought fit completely was the loss of RBI as a telling baseball statistic.
A lightning strike recorded at 9000 frames per second.
The action across time scales displayed in this video is amazing. One strike hovers in the frame almost the entire time while other hundreds of other strikes flicker in and out in single frames.
Its mass — in the units preferred by physicists — is not in the range between 158 billion and 175 billion electron volts, according to a talk by Ben Kilminster of Fermilab at the International Conference on High Energy Physics in Paris.
Electromagnetic waves resonate on a half-wavelength antenna to create a standing wave with a peak at the middle of the antenna and a node at each end, just as when a string stretched between two points is plucked at the center. In the U.S. bed frames and box springs are made of metal, and the length of a bed is exactly half the wavelength of FM and TV transmissions that have been broadcasting since the late 1940s.
(thx, anna)
Update: So, you know when you run across something about some current scientific theory or hypothesis on a blog or in a magazine or newspaper or even in a scientific journal, there’s a fair chance that whatever the article says is misleading, misstated, or even incorrect. That’s just how it is and if you didn’t know, now you do. Take this stuff with a grain of salt. It’s why I use phrases like “suspected cause” instead of something like “box springs and FM radio proven to cause cancer”.
I don’t post things like this because I think they’re right, I post them because I think they are interesting. The geometry of TV signals and box springs causing cancer on the left sides of people’s bodies in Western countries…that’s a clever bit of hypothesizing, right or wrong.
In this case, an organization I know nothing about (Vetenskap och Folkbildning from Sweden) says that Olle Johansson, one of the researchers who came up with the box spring hypothesis, is a quack. In fact, he was “Misleader of the year” in 2004. What does this mean in terms of his work on box springs and cancer? I have no idea. All I know is that on one side you’ve got Olle Johansson, Scientific American, and the peer-reviewed journal (Pathophysiology) in which Johansson’s hypothesis was published. And on the other side, there’s Vetenskap och Folkbildning, a number of commenters on the SciAm post, and a bunch of people in my inbox. Who’s right? Who knows. It’s a fine opportunity to remain skeptical. (thx, tom)
Starting today, I’ll be posting on a different element each weekday (the blog will run through early August), starting with the racy history of an element we’ve known about for hundreds of years, antimony, and ending on an element we’ve only just discovered, the provisionally named ununseptium. I’ll be covering many topics-explaining how the table works, relaying stories both funny and tragic, and analyzing current events through the lens of the table and its elements. Above all, I hope to convey the unexpected joys of the most diverse and colorful tool in all of science.
ScienceBlogs has added a blog about “innovations in science, nutrition and health policy” sponsored by Pepsi to their roster. Posters to the blog will include Pepsi research staff. Some of the other bloggers on ScienceBlogs are not happy.
However, that said, I am completely mystified by ScienceBlogs’ latest development: adding the PepsiCo “nutrition” Blog. How does ScienceBlogs expect to maintain their (OUR) credibility as a science news source (we are picked up by Google news searches afterall) when they are providing paid-for content under the guise of news? Further, I cannot imagine what sorts of credible nutrition research PepsiCo is doing that they can or will actually talk about publicly, nor can I possibly imagine any “food” corporation actually caring about promoting public health. PepsiCo is a corporation, not a research institute, fer crissakes!
These new fossils, of various shapes and sizes, imply that the origin of organized life is a lot older than is generally admitted, thus challenging current knowledge on the beginning of life.
Scientists are working on two fronts toward a cure for AIDS: 1) neutralizing HIV in the human body so that regular medication is unnecessary, and 2) eradicating all traces of HIV in the body.
Human immune-system stem cells are transplanted into pups bred from these mice when they are two days old, and over the next few months, those cells mature and diversify into a working immune system. Then the mice are infected with HIV, which attacks the immune cells. But before transplanting the original human cells, the researchers introduce an enzyme that interferes with the gene for a protein the virus needs to stage the attack. This modification makes a small percentage of the mature immune cells highly resistant to HIV, and because the virus kills the cells it can infect, the modified cells are the only ones that survive over time. Thus, the HIV soon runs out of targets. If this strategy works, the virus will quickly become harmless and the mice will effectively be cured.
Lead ingots carried by a Roman ship sunk in 50 BC will be used to study the decay of neutrinos. Neutrino experiments are very delicate and need to be shielded from radioactive contamination, including possible contamination from the shielding itself.
This vast stretch of time means that the tiny amount of the radioactive isotope lead-210 originally present in the ingots, just as it exists in any normal lead object, has by now almost completely disappeared.
If I were given carte blanche to write about any topic I could, it would be about how much our ignorance, in general, shapes our lives in ways we do not know about. Put simply, people tend to do what they know and fail to do that which they have no conception of. In that way, ignorance profoundly channels the course we take in life. And unknown unknowns constitute a grand swath of everybody’s field of ignorance.
This is part one of a five-part series in which we hear from David Dunning about the Dunning-Kruger Effect.
When people are incompetent in the strategies they adopt to achieve success and satisfaction, they suffer a dual burden: Not only do they reach erroneous conclusions and make unfortunate choices, but their incompetence robs them of the ability to realize it.
Not content with movie stars, California wants its own actual stellar object. The LIFE project at the NIF (National Ignition Facility) at the Lawrence Livermore National Laboratory aims to create a tiny star with intense laser power. How intense? The facility increases the power of the laser beam a quadrillion times before it reaches its target:
The National Ignition Facility, located at Lawrence Livermore National Laboratory, is the world’s largest laser system… 192 huge laser beams in a massive building, all focused down at the last moment at a 2 millimeter ball containing frozen hydrogen gas. The goal is to achieve fusion… getting more energy out than was used to create it. It’s never been done before under controlled conditions, just in nuclear weapons and in stars. We expect to do it within the next 2-3 years. The purpose is threefold: to create an almost limitless supply of safe, carbon-free, proliferation-free electricity; examine new regimes of astrophysics as well as basic science; and study the inner-workings of the U.S. stockpile of nuclear weapons to ensure they remain safe, secure and reliable without the need for underground testing.
Wow. The fusion will produce high-energy neutrons, which will bombard a material capable of converting their energy into heat, which in turn will make steam and eventually electricity. But it gets even better:
In addition, the LIFE engine design can be “charged” with fission fuel. The resulting fission reactions will produce additional energy that can be harvested for electricity production. Moreover, by using depleted uranium or spent nuclear fuel from existing nuclear power plants in the blanket, a LIFE engine will be capable of burning the by-products of the current nuclear fuel cycle. Because the fusion neutrons are produced independently of the fission process, the fission fuel could be used without reprocessing. In this way, LIFE may be able to consume nuclear waste as fuel, mitigate against further nuclear proliferation, and provide long-term sustainability of carbon-free energy. A LIFE engine, via pure fusion or through the combination of fusion and fission, will generate the steady heat required to drive turbines for generating from 1,000 to 2,500 MW of safe, environmentally attractive electric power 24 hours a day for decades.
Number three on this Smithsonian Magazine list is “There have been mass extinctions in the past, and we’re probably in one now.”
Today, according to many biologists, we’re in the midst of a sixth great extinction. Mastodons may have been some of the earliest victims. As humans moved from continent to continent, large animals that had thrived for millions of years began to disappear-mastodons in North America, giant kangaroos in Australia, dwarf elephants in Europe. Whatever the cause of this early wave of extinctions, humans are driving modern extinctions by hunting, destroying habitat, introducing invasive species and inadvertently spreading diseases.
The question of the popular Brontosaurus name verses the technically-correct Apatosaurus name came to a head in 1989 when the U.S. Post Office decided to release a set of four stamps illustrating “dinosaurs.” One in the series was a picture of a large sauropod labeled Brontosaurus. This upset some dinosaur enthusiasts who accused the Postal Service of promoting scientific illiteracy, an ironic accusation given the number of museums that had the animal mislabeled for decades. While there was a hue and cry over the Brontosaurus name, few even mentioned the other, more glaring error, which was the inclusion of a Pteranodon (a flying reptile) in a set of dinosaur stamps. By definition dinosaurs do not have wings.
I totally had no idea this had happened…I must have been brainwashed by all those hours of the Flintstones I watched as a child. (via unlikely words)
Can’t get enough of the Leidenfrost effect? I know! Me either! In addition to helping with nonstick cooking, the L. effect also allows you to stick your hand into an 850° pot of molten lead without injury.
Skip to 1:55 for the good stuff. Bananas! Absolutely bananas! Oh, and this also works for liquid nitrogen as well. (thx, kyle)
This blog post and accompanying videos show you how to preheat your frying pan to the precise temperature at which your food won’t stick. It involves waiting until a small splash of water in the pan forms a single mercury-like ball that floats (literally!) around the pan. Too hot and the water will disperse into smaller balls; too cold and it’ll just boil off instantly.
The water “hovering” over the stainless steel pan like mercury happens due to the phenomenon known as the Leidenfrost effect. You can read more about it on wikipedia, but the basic idea is this: at a certain temperature known as the Leidenfrost point (roughly around 320F for water, but varying with surface and pressure), when the water droplet hits the hot pan, the bottom part of the water vaporizes immediately on contact. The resulting gas actually suspends the water above it and creates a pocket of water vapor that slows further heat transfer between the pan and the water. Thus it evaporates more slowly than it would at lower temperatures. At the proper temperature, a similar effect happens with the food you place in the pan, preventing the food from sticking.
This is possibly the best kitchen tip I’ve ever heard. (thx, jim)
Phil Plait of Bad Astronomy takes on Steve Jobs’ claim that iPhone 4’s pixels are too small for the human eye to see individually. I have confidence in Plait’s conclusions:
I know a thing or two about resolution as well, having spent a few years calibrating a camera on board Hubble.
He may as well have pulled Marshall McLuhan out from behind a movie poster.
Scientists have embedded a nano-sized transistor inside a cell-like membrane and powered it using the cell’s own fuel. The research could lead to new types of man-machine interactions where embedded devices could relay information about the inner workings of disease-related proteins inside the cell membrane, and eventually lead to new ways to read, and even influence, brain or nerve cells.
When I first saw the headline, I thought that it said “embedded a nano-sized transistor radio“…now that would be something. (via jb)
I don’t know what it means, but I always get excited when a longstanding equation is solved. It’s as if another puzzle piece of how the world works has been snapped into place… What, too sappy?
Pennsylvania mathematicians have found solutions to a 140-year-old, 7-dimensional equation that were not known to exist for more than a century despite its widespread use in modeling the behavior of gases.
The Chases, who are professors of anthropology at the University of Central Florida in Orlando, had determined from earlier surveys that Caracol extended over a wide area in its heyday, between A.D. 550 and 900. From a ceremonial center of palaces and broad plazas, it stretched out to industrial zones and poor neighborhoods and beyond to suburbs of substantial houses, markets and terraced fields and reservoirs. This picture of urban sprawl led the Chases to estimate the city’s population at its peak at more than 115,000. But some archaeologists doubted the evidence warranted such expansive interpretations.
“Now we have a totality of data and see the entire landscape,” Dr. Arlen Chase said of the laser findings. “We know the size of the site, its boundaries, and this confirms our population estimates, and we see all this terracing and begin to know how the people fed themselves.”
If we want to travel into the future, we just need to go fast. Really fast. And I think the only way we’re ever likely to do that is by going into space. The fastest manned vehicle in history was Apollo 10. It reached 25,000mph. But to travel in time we’ll have to go more than 2,000 times faster. And to do that we’d need a much bigger ship, a truly enormous machine. The ship would have to be big enough to carry a huge amount of fuel, enough to accelerate it to nearly the speed of light. Getting to just beneath the cosmic speed limit would require six whole years at full power.
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