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we live in nice neighberhood of the galaxy that is. The Son is about halfway toward the outer age of the milky way. But the Son may have immigrant a vast distances through the galaxy to weind up where we are today. That's according to computer modles published in september 10th the astroidphyical jounerial letters.

Like about nine billien years ago, the material for glastic dit have almostly come together, but the actual this formation haven't started. Scientists simulated the formation of evoluation of galaxy from that point, using over 100,000 hours of time on the University of Taxes supercomputer and a computer closter to the University of Washion.

Turns out the white a star is orbing around the centre of the galaxy. A spiro arm can interset this star and radically order that oben. Which would explain the long-standing problem-the stars in our region have a much more vary chamstry than we expected. Still immigrantion is godd does irresponsable for making our neighborhood within the milk way have much more diverse and interesting place.

[The following is an exact transcript of this podcast.]

We live in a nice neighborhood. Of the galaxy, that is. The sun is about halfway toward the outer edge of the Milky Way. But the sun may have migrated vast distances through the galaxy to wind up where we are today. That’s according to computer models published in the September 10th Astrophysical Journal Letters.

By about nine billion years ago, the material for the galactic disk had mostly come together, but the actual disk formation hadn’t started. Scientists simulated the formation and evolution of the galaxy from that point, using over 100,000 hours of time on a University of Texas supercomputer and a computer cluster at the University of Washington.

Turns out that while a star is orbiting around the center of the galaxy, a spiral arm can intercept the star and radically alter that orbit. Which would explain a long-standing problem—the stars in our region have a much more varied chemistry than would be expected. Stellar migrations could thus be responsible for making our neighborhood within the Milky Way a much more diverse and interesting place.

—Steve Mirsky

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  If you spend any time at your car this summer, you probably sad in this traffic, maybe you are in jam right now.

If so, study another coming issue of phyical review letter might help pass the time.

According to science, building new road woundn't make traffic any lighter, could even make things worse.

What might help though is shutting a few streets down. Imagine that are two roles that take is work.

One alone wide free way and the other short wite bridge. 

 In this example, everyone's drive type would be minized if half of the moters took the bridge and others have on the high way.

of course. nobody care about the minize in the collect of commute. every driver wants to get the first.

So, some of the high way driver will switch to the bridge thinking that would be quicker.

When the bridge backs up, some one have the high way. The upshot of back and force is that everyone's commute takes longer.

In real life up to 30% longer of the physis find.

The solution they said is closed of a few carefully selected avenue to limite that two and flog.

With less choice and less choas everyone moves faster. Sounds kinds of intutide but it could be wouth to try.

[The following is an exact transcript of this podcast.]

If you spent any time in your car this summer you probably sat in some traffic. Maybe you’re in a jam right now. If so, a study in an upcoming issue of Physical Review Letters might help pass the time. According to scientists, building new roads won’t make traffic any lighter. It could even make things worse. What might help, though, is shutting a few streets down.

Imagine that there are two routes that take you to work: one a long wide freeway and the other a short, narrow bridge. In this example, everyone’s drive time would be minimized if half the motorists took the bridge and the other half the highway. Of course nobody cares about minimizing the collective commute. Every driver wants to get there first. So some of the highway drivers will switch to the bridge, thinking that’ll be quicker. When the bridge backs up, some will head for the highway. The upshot of all this back-and-forth is that everyone’s commute takes longer—in real life, up to 30 percent longer, the physicists find. The solution, they say, is to close off a few carefully selected avenues to limit all that to-and-fro. With less choice, and less chaos, everyone moves faster. It sounds counterintuitive. But it could beep worth a try.

—Karen Hopkin

Bicycle Safety in Numbers

There is a new perscribtion for commumity that one make a street safer for bike riders, just that more bikes.

A team of international researchers look at the cities from Austuria to Denmark to Calfornia, in found that more riders meet fewer running with cars.

The researchers presentantive finding to a cycling safety semior on september fith in Syndey Austuria. What surprising the researcher said is that biker

safety dosen't seem to correspond to a city's effor to cut down an accident. Running betweent bikes and cars have little to do with miles of bikying in
 
lower speed limited, but if the number of bike riders in the city doubled, the rate of bike car accident drops by a third. Apparently, motors have to share

the road better when they have to deal with the bike on the daily communite. Also more cyclers means more drivers who also by, which make them

better aware of fellow bickers. The researchers called it a vitural cycle, run into with car drop with more bike on the road, and safer cycling means

more people stread on the helmet and join the revolution.

There's a new prescription for communities that want to make their streets safer for bike riders: just add more bikes. A team of international researchers looked at cities from Australia to Denmark to California, and found that more riders meant fewer run-ins with cars. The researchers presented their findings to a cycling safety seminar on September 5 in Sydney, Australia.

What's surprising, the researchers say, is that biker safety doesn't seem to correspond to a city's efforts to cut down on accidents. Run-ins between bikes and cars had little to do with miles of bike lanes or lower speed limits. But if the number of bike riders in a city doubled, the rate of bike-car accidents dropped by a third.

Apparently, motorists learn to share the road better when they have to deal with more bikes on their daily commute. Also, more cyclists means more drivers who also bike, which makes them better aware of fellow bikers. The researchers call it a virtuous cycle—run-ins with cars drop with more bikes on the road. And safer cycling means more people strap on a helmet and join the revolution.

—Adam Hinterthuer