Uncategorized
- Earth
Deep Pacific waters warmed in recent years
Oceanographic data gathered across the North Pacific in 1985 and again in 1999 indicate that the deepest waters there have been heating up.
- Chemistry
New champions among corrosive microbes
Newly discovered strains of bacteria have developed a metabolic shortcut for eating away iron with great efficiency.
- Materials Science
Cinching nanotubes into tough fibers
Irradiating bundles of carbon nanotubes can lead to tougher fibers.
- Physics
Radioactive sprinkles keep machines true
Needing tiny radioactive sources to calibrate medical scanners with ever-sharper vision, an Australian team dipped tiny balls the size of candy sprinkles into a radioactive liquid.
-
19388
I can think of a place other than the moon where NASA could develop a closed life-support system for staging rehearsals of manned Mars exploration. Why not Earth? Advantages would include a protective atmosphere, a day length closer to the Martian sol, bone-and-muscle-friendly gravity, and easy access to mechanical and medical resources. The cost would […]
- Planetary Science
A New Flight Plan
President Bush recently unveiled an ambitious plan for a manned mission to Mars, using the moon as a testing area and stepping-stone, but for many planetary scientists the moon is a desirable destination in and of itself.
-
19387
Your article quotes a pediatrician as saying, “we’re moving to selection on the basis of a trait that is of no benefit to the child to be born.” I disagree. The child to be born would have the benefit of a healthy older sibling. Even saving the parents from the trauma of a dying child […]
- Health & Medicine
Born to Heal
The controversial strategy of screening embryos to produce donors for siblings raises hopes and presents new ethical dilemmas.
- Math
Mining the Tagged Web
IBM's WebFountain project gathers and annotates Web content on a vast scale to serve as a platform for data miners.
-
From the March 3, 1934, issue
High winds atop Mt. Washington, a new tool for brain studies, first chemical proof of the artificial transmutation of elements.
-
National Pi Day
National Pi Day—March 14—is a time to celebrate the number 3.14159. . . . Take a look at how this remarkable number has been honored in various settings, from a middle school classroom to the Exploratorium and Harvard University. Go to: http://www.germantownacademy.org/academics/MS/PiDay/Index.htm, http://www.winternet.com/~mchristi/piday.html, http://www.nvnet.org/nvhs/dept/math/pi.html, http://mathforum.org/teachers/middle/activities/pi_day.html, http://www.exploratorium.edu/learning_studio/pi/, and http://www.math.harvard.edu/piday/index.html
- Earth
Lowering the Boom? Impact crater may predate extinction of the dinosaurs
Analyses of sediments from the Yucatán in Mexico suggest that an extraterrestrial impact there more than 65 million years ago actually happened about 300,000 years before mass extinctions of dinosaurs occurred.
