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NASA debuts fire-tracking Web site | |
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Gizmorama - NASA debuts fire-tracking Web site
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Good Morning,
If you could convert your water heater to solar would you
do it? Here is a link to an article where some students at
UC Berkeley have invented an affordable water heater...
http://abclocal.go.com/kgo/story?section=news/local&id=6279440
Until Tomorrow,
Erin
Questions? Comments? Email me at: mailto:gizmo@gophercentral.com
Email your comments
P.S. You can discuss this issue or any other topic in the new
Gizmorama forum. Check it out here...
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NASA debuts fire-tracking Web site
The U.S. space agency Tuesday unveiled a Web site that provides
information about the impact of fires and smoke on Earth's
climate and ecosystems. The NASA "Fire and Smoke" Web site,
www.nasa.gov/fires, includes regular updates of NASA images
of fires and their associated smoke plumes in the United States
and around the world, the agency said in a news release. It
also has articles on the research results and multimedia
resources from throughout NASA's agencies. The National
Aeronautics and Space Administration said the site is updated
regularly with new images from NASA's Earth-observing satellites
and airborne observatories, including the unmanned aircraft that
pinpointed wildfire hot spots across California.
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Ants go marching using vector navigation
Ants traveling in the desert's relentlessly featureless terrain
use vector navigation to plot their course, researchers at the
University of Zurich found. The strategy allows desert ants to
integrate direction, distance and incline as they travel, the
scientists said in an article published in Frontiers in Zoology.
In their study of desert ant locomotion performed on differently
slanted surfaces, the researchers said they wanted to examine what
mechanisms ants used to estimate step length and inclination. In
a related experiment with ants foraging on slippery surfaces,
researchers said they were able to separate the relationship
between stepping frequency and step length to examine the ants'
ability to gauge distances covered those adverse conditions.
Once they removed the effect of speed, the researchers said they
demonstrated slope had only a "marginal influence" on their
travels. The researchers said they think sensing mechanisms on
the ant's legs could provide the correlation in monitoring
inclination and step length.
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Milkweed's defenses evolve to repairs
The milkweed adheres to the adage "Know your enemy" by using
fast repair work when its defenses are damaged by hungry
caterpillars, U.S. researchers said. Cornell University
researchers examined the way milkweed evolved to the monarch
butterfly caterpillar's changing attempts to disarm the plant,
the Ithaca, N.Y., university said in a news release. They
found the plant may be evolving away from its defenses against
certain caterpillars toward repairing themselves faster than
caterpillars can eat them. "Some plants seem to have shifted
away from resisting (plant-eating animals) and have taken that
same energy and used it to repair themselves," said Anurag
Agrawal, Cornell associate professor of ecology and evolutionary
biology and lead author of a paper in the current issue of the
Proceedings of the National Academy of Sciences. Agrawal and
Mark Fishbein, a Portland State University biologist, found
evolutionary declines in milkweed's three main resistance
traits -- hairs, cardenolides and latex -- and an escalation
in the plant's ability to regrow. One reason, Agrawal said,
could be because as its predators have become so specialized,
the plant was better off choosing a new defensive tactic "to
tolerate the herbivory (plant-eating) damage instead of
resisting it."
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