The Oddities Of Sea-Level Rise | Gravity of Ice Sheets

Note: eleveation of Newport Rhode Island:: 30 FT (9 M) so with a 6.3 meter rise… and of course that 9M figure is an average: much of Newport county is at sea level:

Newport county has a total area of 314 square miles (812 km²), of which, 104 square miles (269 km²) of it is land and 210 square miles (543 km²) of it (66.83%) is water.

This county consists of Aquidneck Island, Conanicut Island, Prudence Island, and the eastmost portion of the state on the mainland. The highest point in this county is at Pocasset Hill, 320 feet (98 m) above sea level, located in Tiverton. The lowest elevation is at sea level.”

If you simply spread the resulting increase in sea level evenly around the world, it would amount to about 5 meters’ worth. But the ice sheet’s gravity is currently keeping sea level artificially low in the Northern Hemisphere, so if it disappeared, the actual increase along the U.S. mid-Atlantic coast would be more like 6.3 meters. In other words, as the West Antarctic Ice Sheet melts and loses mass, its pull on the surrounding ocean will lessen. Seas will drop around Antarctica and parts of the Southern Hemisphere, and that water will be displaced to more northerly areas, such as the east coast of the U.S.

Now that the gorilla has made its presence known, Stouffer is working with Mitrovica to understand its effects in greater detail. A joint paper, due out in a few months, will look into the gravitationally driven sea-level changes a melting Greenland could trigger.

“The signal [i.e. the pull of gravity from the ice sheet]] is so large,” says Stouffer, “that if you own beachfront property in Iceland, and all of the ice on Greenland melts and adds seven meters to average sea level, you end up with more beach. But in Hawaii, you get your seven meters of sea-level rise plus an extra two or three on top of that. It’s phenomenal to me that it matters that much.”

via The Oddities Of Sea-Level Rise | The New Republic.

Saltwater Aquariums Spur Debate on Sustainability

The result has been a growing market for these and other reef invertebrates, many of which are supplied by about 165 licensed collectors in Florida. Those involved in the Florida fishery, which is concentrated in the Keys, say that it is sustainable and more closely managed than many others, with no new licenses permitted and daily limits on many species.

But scientists argue that the collecting poses a threat to the very ecosystems aquarium hobbyists aim to replicate. Aside from the long-recognized ecological impact of the trade in live coral itself, these researchers say the demand for invertebrates — creatures that often serve the same cleaning and pest-control roles in a tank that they do in nature — is such that the fishery may be unsustainable. Continue reading

Montessori – Mathematics – Introduction

Introduction to Mathematics

Math is all around the young child from day one. How old are you? In one hour you will go to school. You were born on the 2nd.

Number itself cannot be defined and understand of number grows from experience with real objects but eventually they become abstract ideas. It is one of the most abstract concepts that the human mind has encountered. No physical aspects of objects can ever suggest the idea of number. The ability to count, to compute, and to use numerical relationships are among the most significant among human achievements. The concept of number is not the contribution of a single individual but is the product of a gradual, social evolution. The number system which has been created over thousands of years is an abstract invention. It began with the realization of one and then more than one. It is marvelous to see the readiness of the child’s understanding of this same concept. Continue reading

New Finding Puts Origins of Dogs in Middle East

Wayne was surprised to find that all the herding dogs grouped together, as did all the sight hounds and the scent hounds, making a perfect match between dogs’ various functions and the branches on the genetic tree. “I thought there would be many ways to build a herding dog and that they’d come from all over the tree, but there are not,” Dr. Wayne said

via New Finding Puts Origins of Dogs in Middle East – NYTimes.com.

Strogatz on Math: Finding Your Roots – Complex Numbers-Fractals

Finding Your Roots

By STEVEN STROGATZ

Steven Strogatz on math, from basic to baffling.Tags:complex numbers, computers, imaginary numbers, negatives, square rootsFor more than 2,500 years, mathematicians have been obsessed with solving for x. The story of their struggle to find the “roots” — the solutions — of increasingly complicated equations is one of the great epics in the history of human thought.And yet, through it all, there’s been an irritant, a nagging little thing that won’t go away: the solutions often involve square roots of negative numbers. Such solutions were long derided as “sophistic” or “fictitious” because they seemed nonsensical on their face.

via Finding Your Roots – Opinionator Blog – NYTimes.com.

Reviews of Singapore Math curriculum from Homeschool Math

Grades: 3-4: Comments from Homeschooling Parents

(lots of good insights here… read them all)

We had used Singapore at home in 3rd and 4th grade, and loved it. When I homeschooled 2nd-4th grade we tried many math curricula that only frustrated my gifted daughter. The drill and repetition was overkill for her and made her dislike math. Finally Singapore worked very well for her and she earned A+ in math while in school in 5th and 6th grade.

via Reviews of Singapore Math curriculum from Homeschool Math. Continue reading

Intel CEO on Decline in US Competitiveness

Otellini noted that a 2009 study done by the Information Technology and Innovation Foundation and cited recently in Democracy Journal “ranked the U.S. sixth among the top 40 industrialized nations in innovative competitiveness — not great, but not bad. Yet that same study also measured what they call ‘the rate of change in innovation capacity’ over the last decade — in effect, how much countries were doing to make themselves more innovative for the future. The study relied on 16 different metrics of human capital — I.T. infrastructure, economic performance and so on. On this scale, the U.S. ranked dead last out of the same 40 nations. … When you take a hard look at the things that make any country competitive. … we are slipping.” Continue reading