"Our World" theme
week on "Our World" ... The strongest tropical cyclones are getting
stronger ... Exercise may slow Alzheimer's memory loss ... and NASA gets ready to fix a remarkable
earth-orbiting telescope ...
GRUNSFELD: "The Hubble Space Telescope is more
than remarkable. ... It's answered just so many of those fundamental questions
that people have been asking about the cosmos since people were able to ask
stories, Google's new web browser, and more. I'm Art Chimes. Welcome to VOA's
science and technology magazine, "Our World."
storms have been getting stronger
of the most powerful storms on earth are getting stronger, according to new
research published this week.
ELSNER: "If we look at over the entire globe,
we see that the strongest tropical cyclones are actually getting stronger. And
this increase is most notable over the North Atlantic and also the northern
Elsner of Florida State University and his colleagues based their conclusion on
25 years of satellite data.
found that the top wind speeds in the strongest tropical cyclones have been
increasing. And the stronger the cyclone, the bigger the increase.
say these storms pick up energy from the warm water they pass over. Elsner says
that's really a simplified version of what's happening.
ELSNER: "And this thermodynamic theory of
hurricane intensification says that, with all else being equal, the warmer the
ocean, the stronger the storms. So it stands to reason that if the theory is
correct we should see increases in the intensity of the strongest storms with
the warming ocean."
that's exactly what they saw. For their study, Elsner and his colleagues
examined the top wind speed in a range of storms, from weak to strong.
storms showed little or no increase in their maximum wind speed over 25 years
of observations. But in the same period, the top wind speed in the strongest
storms rose significantly.
ELSNER: "Generally the wind speed and how much
power, destructive power a hurricane has are very well correlated."
although the storm data comes from satellites, Elsner says satellite
instruments don't measure the wind speed directly.
ELSNER: "But what you can do is look at how the
pattern of the satellite pictures are changing over time. If you see how the
clouds change from one picture to the next, you can get some idea of motion. So
if you look at where the clouds were at one time, then later, you get some idea
effect the researchers observed was not evenly distributed around the world,
probably because of different conditions in the various areas where tropical
ELSNER: "Well, we speculate that has to do with
the amount of warming we're seeing in the different basins. So basins that are
marginally warm enough to support tropical cyclones on average and are
increasing, then we expect to see the effect stronger in those basins, and
those include the North Atlantic and Indian Oceans."
this effect related to climate change? Elsner says his study looked at data
from the past quarter-century, so he says it can't necessarily predict what's
in the future. But warmer oceans could provide the energy to fuel stronger
storms, and he said the data is consistent with the idea that global warming
could affect sea temperatures.
ELSNER: "That gives us some confidence that if
the seas continue to warm, we're likely to see the stronger storms getting
Elsner of Florida State University. His paper appears this week in the journal Nature.
program helps stroke victims
two stories about how exercise can help people who are ill.
are caused when something disrupts the brain's supply of blood — along with the
oxygen it carries. When this happens, the stroke victim is often left disabled.
As we hear from health reporter Rose Hoban, new research indicates it may be
possible to reverse some of the effects of a stroke.
HOBAN: For many years, doctors believed that this
kind of disability was irreversible.
in the past few years, researchers have been testing ways to help stroke
patients regain movement and strength. Dr. Andy Luft and a team from the Johns
Hopkins University in Baltimore worked with patients from a local Veterans'
Affairs Hospital. They gave half of them an intensive exercise regimen.
LUFT: "We were training them in the VA
hospital on a treadmill program for six months, which is three times a week for
about an hour. And then we studied them before and after the six-month training
program and we assessed walking and cardio respiratory fitness."
HOBAN: Luft and his colleagues found that the
treadmill patients were able to walk faster than another of group of patients
who only did stretching exercises. They also had better heart and lung function
after the training.
researchers also put the patients who were getting treadmill training into a
brain scanner, and had them move their legs as if they were walking.
LUFT: "And that will show you all the brain
areas involved in this movement, and likely involved in walking. And then we
compared before and after training and sought changes reflecting what we called
plasticity in the brain. So, a reprogramming of these brain circuits that
control walking. And that's what we're after."
HOBAN: Luft says they're not sure exactly how this
brain 'rewiring' takes place. He says it might be that the brain taps into some
very primitive areas during the retraining process.
LUFT: "Through this training after stroke,
these evolutionary old regions are reactivated and may be able to
HOBAN: Luft says the retraining has to be very
intense in order to be effective. But he says it opens up the possibility that
people might be able to regain abilities after losing them to stroke.
research is published in Stroke: Journal of the American Heart Association.
I'm Rose Hoban.
may help Alzheimer's patients, too
study indicates that people with Alzheimer's Disease may also benefit from
is the crippling brain disease that causes memory loss and other problems,
mainly among the elderly.
VOA's Jessica Berman reports, there are some promising findings from a small
study of older men and women in Australia
BERMAN: Experts say the number of people afflicted
with Alzheimer's will quadruple by the middle of the century because people
around the globe are living longer and Alzheimer's tends to strike older
new study suggests that the dementia that is a hallmark of the disease could be
delayed among patients who exercise moderately three times per week.
at the University of Western Australia conducted a study involving 138 adult
men and women, aged 50 and over, that had memory problems but not dementia.
participants were randomly assigned to a moderate intensity exercise program
for six months. Researchers had them exercise an average of 50 minutes three
times per week. Most of them walked. The other group was educated about
exercise, but was not encouraged to do so.
the end of the study, those in the regular exercise group did better on
cognitive tests to assess their memory, according to Nicola Lautenschlager, a
psychiatrist who specializes in the elderly.
LAUTENSCHLAGER: "What we do not know at this point of time
is the mechanism underlying this effect."
found the benefit was small, with a modest improvement on the cognition scale.
But Lautenschlager says the study showed that exercise is more effective than
medication, which has little or no effect at improving mild memory loss.
is sufficiently encouraged that she says doctors may change their advice to
patients with Alzheimer's disease.
LAUTENSCHLAGER: ""We need to reconsider what we
recommend to older people when they ask us what kind of healthy lifestyle do I
need to do to protect my brain."
study on the benefits of exercise in delaying the dementia in Alzheimer's
disease is published in the Journal of the American Medical Association.
Jessica Berman, VOA News, Washington.
news on our Website of the Week
again for our Website of the Week, when we showcase interesting and innovative
week it's a way to get all your environmental news in one convenient place.
NORTON: "The trend is that sustainability and
environmental news is going to be ever-growing, and we want to make sure that
we cover everything."
Norton is publisher of the Environmental News Network at enn.com.
NORTON: "Environmental News Network likes to think
that we are a broad but relatively deep news network. So we try and cover as
many topics as possible. Some of those could include science and technology
breakthroughs or environmental health."
says ENN collects stories from trusted sources, including news agencies and
NORTON: "We have an affiliate network of people
who submit stories to us, about 35 partners. And basically, ENN publishes their
stories through our website, as well as commentary and bloggers from around the
stories appear on the home page, of course, and to help you explore more
environmental news, it's all sorted under categories such as wildlife,
ecosystems, climate, and green building.
aggregates news, but it also distributes news in the form of press releases by
a wide range of organizations involved with the environment.
NORTON: "So we work with over 200 nonprofits to
get these stories out and around. You'll see all of these announcements from
our press members. And some of those stories, I think, are sometimes even more
interesting that what you can find above the fold."
Environmental News Network. Read all about it at enn.com, or get the link to
this and more than 200 other Websites of the Week from our site,
MUSIC: "Speed House"
listening to VOA's science and technology magazine, Our World. I'm Art Chimes
introduces Chrome web browser
the Internet search company, turns ten years old this weekend. It was incorporated on September 7, 1998, by
two 24-year old Stanford University students, Sergey Brin and Larry Page, who
today are still at the helm of what is now a publicly-traded company worth more
than $150 billion.
in the past decade has expanded into several other Internet applications,
including a global map program, an e-mail service and an online
word-processor. This week, Google introduced a new web browser called Chrome.
It competes with the market leader, Microsoft Internet Explorer, the popular
open source Firefox browser, and Apple's Safari for Macintosh users.
find out more, we checked in with Rafe Needleman, editor of CNET's Webware.com,
where he writes about "cool web apps for everyone." He was at
Google's press event on Tuesday and has been testing out Chrome for
NEEDLEMAN: "Well, it's fast. Chrome is based on a
rendering engine, the engine underneath it, there are two parts, one of which
makes web pages load pretty fast, and the other one, called V8, works on
pages are written in, like Google's Gmail or maps or stuff like that. And it's
advanced, interactive web pages, web applications, should work more quickly in
Chrome than other products."
Q: You know, I like to think of the three s's
in terms of browser usability: speed, you just addressed, but [also] stability
and security. How does Chrome stack up in those departments?
NEEDLEMAN: "We've done some early tests and we've
determined that it is, in fact, faster. In terms of stability there's a very
key element of Chrome, which is that each tab is a separate process, which
means if you go to a web application that crashes, it will only crash that tab.
It won't bring the whole browser down around it."
Q: What about the user interface itself? There's no separate search box, for example.
From the user's point of view, how does the interface differ?
NEEDLEMAN: "Yeah, it does mirror the Google
aesthetic, which is definitely spare. There is no menu bar. And for a Google
product, there is no search box. How funny is that? What they have is something — the address bar they call the Omnibox. When you type in the web address
of a place you've been to before, it fills it in for you automatically. You
just press enter to go there. If you type in something that is a search query that
is not an Internet domain, it fires off the search. The home page for Chrome is
a really useful thumbnail view of the sites that you go to most often and most
frequently, along with a list of search engines you use and recent things added
to your bookmarks.
not sure I would recommend that people jump over today. Not all websites
render perfectly in Google. It is, after all, still a beta of a 1.0 product.
But it does show kind of the direction of where things are going."
You mentioned that this is a beta, and Google does seem to love beta versions,
but what's missing from Chrome. Obviously there's a development roadmap still
NEEDLEMAN: "There are a few key things still
missing from Chrome. For example, if you are a Macintosh or a Linux user, there
is no Chrome for you. Google says, our developers are Mac users. They want it
as much as we do. So they're working on it.
another key thing that's missing that Firefox has made a lot of hay with is an
architecture for extensions. Those are the things that you add into Firefox to
do things that it doesn't do inherently out of the box. Again, Google says it's
on the roadmap and they'll layer it in as soon as it's ready, but it's not
Why is Google doing this? What's in it for Google to have a browser of their
own out there?
NEEDLEMAN: "That is the million dollar, or in
Google's case the $40 billion question. The more people who use the Internet,
the better it is for Google because Google makes a lot of money from
advertising queries and search queries on the web. And what this platform does — and this is a platform, not just a
browser — more designed for web applications as opposed to just web pages - the
more Google can encourage people to write complex and rich web applications,
the less they need the traditional operating system.
programmers start to write applications that run well on Google [Chrome], the
other browsers, Google hopes, will have to scramble to keep up. So even if people don't use Google's Chrome
and the other browsers get better and people continue to use the other
browsers, they're still using browsers, they're still using the Internet.
Google still profits."
Needleman, editor of Webware.com. He also said that at this week's news
conference, Google officials made a big deal of the fact that it's being released
in more than 40 languages, including Mandarin, Arabic, and Hindi, as well as
most European languages.
preparing for Hubble Telescope repairs
just over a month [Oct 8], the space shuttle Atlantis will blast off from
Florida, heading not for the International Space Station, its usual
destination, but for the earth-orbiting Hubble Space Telescope.
will maneuver the bus-sized telescope into the shuttle's cargo bay, then
perform a series of space walks to install new science instruments, replace
batteries and gyroscopes, and generally do what's needed to keep Hubble in good
shape until its replacement is launched, five years from now.
Mike Massimino will be on two of the five space walks.
MASSIMINO: "We're going up to Hubble and we're
going to put in a new Wide Field Camera, which is going to increase the
telescope's ability to see into the universe by a factor of 10, so we can see a
lot of cool stuff if we do our job right and this thing works. So we're excited
about the Wide Field Camera, and also the Cosmic Origins Spectrograph, which is
another big scientific instrument we're putting in. So those things are going
to increase the science capability of the telescope."
was on one of the previous Hubble servicing missions. His crewmate, John
Grunsfeld, was on three of the four prior Hubble repair flights.
GRUNSFELD: "The Hubble has been in orbit for 18
years. It's a remarkable period of time for any spacecraft to be operating at
the level Hubble has, and in an environment that's pretty nasty, and that takes its toll on the telescope."
academic background is in physics and astronomy. He says it's important to keep
Hubble working as long as possible because of the contributions it's made to
GRUNSFELD: "The Hubble Space Telescope is more
than remarkable. It has produced all of the science that we expected it would —
the discovery that black holes really do exist, massive black holes millions of
times the mass of our sun. It's measured the age of the universe. It's answered
just so many of those fundamental questions that people have been asking about
the cosmos since people have been able to ask questions."
the shuttle program's second fatal accident in 2003, NASA cancelled the planned
repair mission to Hubble. Astronomers and other supporters of the space
telescope urged the decision be reversed, but NASA considered the flight too
dangerous. If there were any problem with the shuttle, they said, the
astronauts would be stranded. Space flight is inherently dangerous, so NASA now
includes extensive inspections of the shuttle in orbit. And crew commander
Scott Altman explains what happens if they find a problem.
ALTMAN: "So we will shelter in place on our
[shuttle] orbiter, power down to extend the life, the oxygen, and we can go up
to roughly 25 days waiting for somebody to come up to us. Meanwhile, NASA's
decided to have an orbiter on the pad so the day we launch, that if we find
damage flight day 2 or flight day 3, turn that mission on, and by our flight
day 7 or so, they're airborne, coming up after us."
11-day shuttle flight to the Hubble Space Telescope is set to begin October 10.
test for world's largest physics experiment
biggest science experiment on Earth is expected to take a big step forward on
at the European Organization for Nuclear Research, better known by its French
acronym, CERN, are planning to send a beam of particles racing around the
27-kilometer ring of the Large Hadron Collider for the first time.
LHC, as it's known, is the world's most powerful particle accelerator. CERN
physicist Tejinder Virdee says it's designed to explore some of the most
fundamental questions in physics.
VIRDEE: "At the end of this, it is possible
that our view of nature, of how the nature works at the fundamental level,
would be altered in the same way, for example, that Einstein had altered our
view of space and time about 100 years ago. So the scientific results could be
Large Hadron Collider is housed in a circular tunnel, buried under the
French-Swiss border just outside Geneva.
of subatomic protons and other particles will be sped around the ring — and
accelerated up to nearly the speed of light — by 1,800 superconducting magnet
will reach an energy level of 7 trillion electron volts, seven times more
powerful than in any existing accelerators. The project has cost an estimated
the LHC goes into full operation, scientists will aim beams of particles
directly at each other. When particles collide — up to 600 million times a
second — special sensors will detect and record the collisions, and a network
of computers will analyze the vast amount of data generated.
designed in part to mimic conditions present at the beginning of the universe,
the Big Bang, almost 15 billion years ago.
also be looking for a subatomic particle that is predicted by the Standard
Model of particle physics but has never been seen. CERN physicist Mike Seymour
says the elusive Higgs Boson has a nickname that conveys its importance.
SEYMOUR: "People call it God's particle because
it really has a very important central role in our whole theory of what
everything is made of, of matter. Because without the Higgs particle we
wouldn't be able to understand why any of the elementary particles have masses.
The more we discover about the Higgs mechanism, the more we will understand
about the dynamics of the early universe."
scientists and technicians prepare to send a particle beam all the way around
the LHC this week, some critics have wondered whether attempts to reproduce
conditions at the beginning of the universe may create a black hole that could
destroy the Earth.
CERN team that studied the matter concluded there was no danger of such an
outcome, and lawsuits filed by opponents have not succeeded in stopping work on
the LHC. But CERN physicist John Ellis says the critics are wrong.
"LHC is only going to reproduce what nature does every second, it has been
doing for billions of years, and all of these astronomical bodies including the
earth and the sun, they are still here. So there really is no problem."
let's hope not.
"Our World" theme
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