January 28, 2009

Yes, stars grow by “eating” the gas and dust around it. It was thought that there was a limit as to the size to which a star could grow but it has been found that this is not true. The logic behind this is that when the star grew large enough and ignited it blew away the gas and dust around it and reached its maximum size. The study found that after the star’s ignition there’s still gas and dust for it to feed on continuously. Not only do they “eat” gas and dust but also if they’re big enough then their gravity pulls smaller stars towards it and absorbs them. This makes them even bigger.
To find out more check out the ScienceNOW article by Phil Berardelli.
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Science, Teacher Resources | Tagged: dust, eat, gas, grow, ignition, stars |
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Posted by jaschiram
January 23, 2009

The island of Macquarie, which is south of Australia and administered by the Australian state of Tasmania, is facing major “environmental devastation” caused by the removal of feral cats from the island. The island is a UNESCO Biosphere Reserve, a World Heritage Reserve, and a Tasmanian State Nature Reserve. It has all these classifications to give it the maximum protection possible. Regardless, species that are not native to the island are killing the native plants and animals.
Cats were killing tens of thousands of native seabirds, some of which are classified as threatened. In a project to stop the birds from becoming extinct, cats were eradicated from the island after several decades of attempts. Now the rabbit and rodent non-native populations, which were being kept in check by the cats, have exploded. Rabbits are destroying the vegetation and the rats and mice are eating the seedlings, bird’s eggs and fledglings.
This is what happens when you meddle with the ecosystem, even with the best of intentions, without thinking long and hard, says the article. “The lessons for conservation agencies globally is that interventions should be comprehensive, and include risk assessments to explicitly consider and plan for indirect effects, or face substantial subsequent costs.”
Rabbits, rats and mice will start to get eradicated in 2010 to help the island and it’s native plant and bird species recover from the invasion that has lasted about a century. For more details go the the January 13, 2009 article by Michael Casey and the Sydney Morning Herald April 12, 2007 article.
This can be used when teaching the balance of an ecosystem in Intermediate Science and Living Environment Core Curriculums.
Other cases of ecosystems affected by nonnative species are in New Zealand, Hawaii, Pacific Islands, Aleutian Islands, etc.
Which cases do you know about?
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Community, Environment, RAC-CEMS, Science, Student Resources, Teacher Resources | Tagged: Aleutian Island, Australia, balance, Biosphere, bird, cat, Curriculum, devastation, ecosystem, egg, Environment, fledgling, Hawaii, Intermediate Science, Living Environment, Macquarie, mice, New Zealand, Pacific Island, rabbit, rat, Reserve, rodent, seedling, State Nature Reserve, Tasmania, UNESCO, World Heritage |
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Posted by jaschiram
January 18, 2009

Are you interested in plant life?
Create one to five videos related to plants and upload it to YouTube following the contest’s instructions. You might be able to win $$$$.
Deadline for entering the contest is March 1, 2009. Anyone is eligible to participate.
For more information visit the ChloroFilms website.
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RAC-CEMS |
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Posted by jaschiram
January 14, 2009

You might be saying: WHAT?
Yes, based on a Wall Street Journal report, Mathematicians have the best jobs. Based on the report, they have the best job because they work in better conditions that other occupations on the list and have a pretty good median annual income of $94,160.
The jobs in second and third positions, actuary and statistician respectively, are also branches of mathematics. Software Engineer and Computer Systems Analyst, which are in the fifth and sixth positions respectively on the list, are applications of math.
Teachers and Parents: you can use this to encourage your students and children to study for mathematics related professions if they like and are good in math.
Full Article
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Math, Parent Resources, RAC-CEMS, Student Resources, Teacher Resources | Tagged: actuary, best, career, computer systems analyst, job, mathematician, profession, software engineer, statistician |
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Posted by jaschiram
January 8, 2009

This morning, National Public Radio outlined several biological changes overeating may cause in our bodies. Even if guilty of such indulgences, an awareness of them will help curb the pattern instead of prolonging it into the new year. Here is a summary of what Patti Neighmond, NPR corespondent said:
- Overeating interrupts internal clockworks: you may not sleep as well, and are prone to midnight snacking.
- A diet full of sugary foods will send your body mixed signals: an increase in the amount of “hormones and metabolic processes” confuses your body and can result in dramatic changes of blood sugar levels.
- Your stomach may be confused: repeated overeating wares out tissues located at the top of your stomach. These tissues sends a signal to the brain that your stomach is full… tired tissues do not send the message, and consequently, you may not know you are full.
When recovering from holiday celebrations, stop and think of the sciences behind your body: anatomy, biology, chemistry, etc. The intricate connection of individual body systems functions best when fueled with healthy foods and drinks. Celebrate January with a fresh salad! Raise your fork high and celebrate science with each bite!!!
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STEM in the News | Tagged: anatomy, biology, diet, health, Holiday Eating, stomach |
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Posted by aschlag9