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Showing posts from July, 2014

Superheating a Liquid to Create a Single Bubble

When a superheated material begins the transition from one phase to the next (like liquid to gas), small bubbles can form, a process called bubble nucleation. Scientists at Harvard have presented a new method for studying superheated materials in the moments before, during, and after bubble nucleation.

Podcast: Comic-Con 2014

This week's Physics Central Podcast is all about comics! And physics! Last week, few members of the Physics Central team headed to San Diego Comic Con 2014 (we saw some awesome science costumes)  to give away free physics comics and get people excited about science. But physics and comics aren't such strange partners. This week on the podcast I talk to Simon Oliver, creator of the new comic FBP: Federal Bureau of Physics. In the world of FBP, the laws of physics are breaking down, causing things like gravity to temporarily fail in a high school school parking lot, and a bubble universe to appear in the sky above a city. 
I also talked to Larry Young, creator of the comic Astronauts in Troublea slightly futuristic tale about a the most affluent man in the world claiming ownership of the moon. The comic is largely inspired by Young's love of NASA and space flight. 
Listen to the podcast to hear more!!

San Diego Comic Con: Science and Cosplay

This last weekend, the Physics Central team traveled to San Diego to get people excited about physics. Of course, many Comic Con attendees need no convincing on that front (like Chewie! He loves our comic books!). Science and comics (not to mention science fiction) go hand in hand, mutually influencing and inspiring each other. We saw a bunch of science-themed costumes, and discovered that many of the cosplayers are actually scientists in disguise.

Development Of Airplanes Is Like Biological Evolution

Airplanes and birds may have followed similar pattern to increase efficiency. 


The development of passenger aircraft over the past century mirrors the evolution of flying animals, and shows that evolution is not just a biological phenomenon, according to a paper published today in the Journal of Applied Physics.

Greetings from San Diego Comic Con!

The Physics Central Team has traveled west to the Mecca of all things Nerdy: San Diego Comic Con. Here's this year's team, including this Comic Con first-timer.  It's lovely weather here in San Diego, but we're mostly staying inside enjoying the many amazing sights of this awesome gathering. Take a look after the jump.

Podcast: July News Round Up

This week on the podcast, Mike Lucibella and I are bringing you some of our favorite physics news stories from July.

Some very cool technologies were announced or revealed this month. There's Vantablack, the darkest material ever invented (it absorbs all but .035% of light). It gives the impression of looking down a hole, even when it's wrapped around a 3D surface. There's also the announcement that a private company, LightSail, will test a solar sail technology in 2016. Solar sails use the physical force of photons from the sun to gain speed, the way a regular sail might use the force of wind. Solar sails have appeared in science fiction, but they could be a realistic means of getting around in our solar system without having to pack fuel for the voyage.

Scientists at the National Ignition Facility—purportedly the largest laser in the worldused their laser powers to put a bit of diamond under an incredible amount of pressure: 50 million times the Earth's atmospheric…

Particle Dense Suspensions Lead to a Smoother Surface

Scientists at the University of Chicago have discovered a new way to create a smooth coating of a sprayed material on a surface. Using a dense suspension of particles, their technique allows for a drop to rapidly form in an even layer on a surface.
In the past, viscosity and 'wettability' affected spraying a liquid (like paint) onto a smooth surface. Wettability deals with how easily the liquid spreads across a surface: a drop of water behaves differently on a piece of steel than on teflon. A liquid that's too thick doesn't spread easily, either. This new method is less susceptible to these problems.

Physics Central at Comic-Con 2014

Once again, the Physics Central team will be attending this year's Comic-Con International in San Diego from July 23rd through July 27th.

We'll be handing out tons of free laser and Tesla comic books along with extra goodies for Comic-Con attendees.



Here's what you need to know:

Where:
Booth number 2207 in the Exhibit Hall of the San Diego Convention Center.

When:
Wednesday, July 23, 6:00 pm - 9:00 pm

Thursday, July 24, 9:30 am - 7:00 pm

Friday, July 25, 9:30 am - 7:00 pm

Saturday, July 26, 9:30 am - 7:00 pm

Sunday, July 27, 9:30 am - 5:00 pm

Why:
We'll be handing out tons of free Spectra comic books, Tesla comic books, and LED "throwies." Also, we'll be selling "Keep Calm and Fermion" shirts at the booth. Stop by, learn some physics, and take back some science souvenirs.



You can check out our blog post from last year to see what we got up to. And if you can't make it to this year's Comic-Con, you can read the comic books online or order…

What Rolling Over in Your Sleep Can Say about Your Health

Whether awake or asleep, people can only lie still for so long. Staying in one position for too long can lead to bed sores as well as circulation and breathing problems. Sleeping without moving enough can also be an indication that something is medically out of order.

Various researchers have monitored turnover dynamics of sleeping people over the years, mostly by counting the number times and how far someone turns in a given period. But these two numbers are often not enough to distinguish between the sleep patterns of healthy and sick people.

A new study by a group of physicists in Japan may have found a way to glean crucial health information from the motions of sleeping people by performing a slightly more detailed analysis of their motions.

Podcast: Voices of the Manhattan Project

Sixty-nine years ago today, a huge fireball rose slowly above the New Mexican desert. The Trinity test signified that for the first time, physicists working on the Manhattan Project had successfully split the atom and built the first nuclear bomb.

The Atomic Heritage Foundation'sVoices of the Manhattan Project website is an unparalleled trove of historic interviews with the veterans of the project. There's collected historic recordings of everyone from the heads of the project like physicist J. Robert Oppenheimer and General Leslie Groves, to more recent interviews with the people that history often overlooks, like the secretaries, technicians and people who just lived nearby.

On this week's podcast, we spoke with the founder and lead interviewer at the foundation, and heard some of the lesser known stories of the Manhattan Project. It's an amazing peek inside America's secret cities of World War II.

Bubbles Help Your Pancakes Gel

My family was big on Sunday morning breakfasts growing up, and pancakes made a frequent appearance. When I was old enough to learn how to make them, my father shared one common piece of advice: wait to flip the pancakes until bubbles start to burst on the top of the batter and hold their shape.
I always thought the most interesting part of this instruction was waiting for the shape to hold. That precise moment indicates the pancake is in the state of changing from a liquid to a gel, and bubbles are the best way to tell.

The Most Highly-Cited Universities and Countries

Publish or perish.

That's the mantra many young researchers live by as they compete to establish their early scientific career. But not all publications are treated equally in the world of academia.

Some journals are considered more prestigious than others, and some papers are cited much more widely than others — a quantitative measure of a paper's influence.

And when there's a way to quantitatively evaluate a group, rankings will inevitably emerge. Each year, Thomson Reuters releases a report on the "World's Most Influential Scientific Minds" primarily based on the number and impact of a researcher's academic publications.

While the report focuses on individual researchers, the data also reveal where the highest concentrations of influential researchers work. Several big academic names make an appearance, but there's also a few surprises.

For the latest report, Thomson Reuters used data from the past 11 years to compile a list of researchers with the…

Impact Craters May Have Cradled Life On Early Earth

Asteroid and comet impacts could have created refuges for early life on Earth, protecting the first microorganisms from the sun’s harsh rays when the planet still lacked an ozone shield.

“Most people associate impacts with the extinction of the dinosaurs, but they can also be beneficial to life,” said Gordon Osinski, a geologist at the University of Western Ontario in London, Canada.

Podcast:Yoctonewtons: The Smallest Recorded Force

This week on the Physics Central Podcast, I talk with physicist Dan Stamper-Kurn about making the smallest measurement of a force ever recorded.  He and his group (including lead author Sydney Schreppler) applied a force to a cloud of 1200 atoms, using a laser. Their measurement came out to 40 yoctonewtons: that's 40 x 10-24 newtons (if you drop an apple from a third story window, it hits the ground with about 1 newton of force).

The reason this measurement is significant is because it gets to within a factor of 4 of the standard quantum limit, or SQL. This is a natural limit to how precisely scientists can measure certain variables. (The proof for this is in the Heisenberg Uncertainty Principle).  The limit arises through various means, but scientists reach it when the system itself has an uncertainty greater than the measurement. In many cases, the observer imposes this limit: for example, if a scientist uses photons to study a single atom, the photons may start to influence the…

Expect Delays: Why Trains Slow Down When It's Hot

Last week I took an Amtrak train south for the holiday weekend, and there was a delay. The explanation: the track was under a 'heat advisory' and the train had to travel at a slower speed. This left me wondering what happened to the tracks when it got so hot outside - and why they couldn't travel at speed.
Most railroad tracks are metal and when (most) metal heats, it expands. As the temperature rises, the molecules in the metal vibrate more, and they need more 'space,' so the volume increases. Different materials expand at different rates when they're heated. That's why if you have a glass jar with a lid you can't open, you can run it under hot water. The lid will expand more than the glass - allowing you to easily open the container.

Shockingly Smart: The Physics Behind Brain Stimulation

There's been a lot of buzz lately about a therapeutic and augmentative procedure called tDCS, with promising results. tDCS may not only aid in the treatment of conditions such as depression and anxiety, but it also may be a quick, non-invasive way to improve focus, learn skills faster, and remember facts more easily while studying.

If you're wondering why you haven't heard of this miracle technology yet, it's because of what tDCS stands for: Trans-cranial Direct Current Stimulation. In layman terms, that's "putting electrodes on your head in hopes of shocking yourself smarter". At first blush, maybe it doesn't sound so appealing, but bear with me.

Podcast: Dark Stars and Cosmic Cocktails

In Katherine Freese's new book The Cosmic Cocktail: Three Parts Dark Matter, she traces the history of dark matter and her career as an astrophysicist navigating through it.

For the last few years, she's been developing her theory of dark stars, giant primordial stars powered by dark matter annihilations, which she talks about in this week's podcast. Most recently she and her fellow researchers have been probing whether they are not only bright and gigantic, but also if they pulsate.

Certain kinds of stars, called Cepheids, expand and contract regularly in a cycle of heating and cooling. As they heat up, they expand out until they're so big they start cooling down and contracting again. On Earth it looks like they're getting brighter and dimmer over time. The length of their cycle depends on their average luminosity. Knowing their absolute brightness means that scientists can tell how far away they are by gauging how dim they appear. They're used as the standa…

More Interesting than Watching Nail Polish Dry

Some salon manicures require you to dry your freshly painted nails under a UV light. But why only certain types of manicures and why UV? Why don't you always dry your nails with a UV light? And when you do paint your nails at home, why does cooling wet nails help them dry faster?
Nail polish fundamentally consists of four things: solvents, polymers, pigment, and plasticizers. The plasticizers increase the flexibility of the polish, and pigment adds color. The polymers strengthen the polish, make it easy to spread, and help it stick to the nail. The solvents keep everything mixed together until they evaporate, leaving behind a smooth nail polish.