Uncategorized
- Planetary Science
Mars Photo of the Day
With a stock of more than 120,000 images, the camera team for NASA’s Mars Global Surveyor mission has started daily postings of pictures to showcase the diversity of Martian landscapes. Click on the photo to obtain additional information about what the image reveals. Go to: http://www.msss.com/
- Math
Sequence Puzzles
Given a sequence consisting of the whole numbers 1, 4, 9, 16, 25, 36, and 49, what number comes next in the sequence? The most likely answer is 64–the next number in a sequence of squares of consecutive integers, starting with 1. Such sequence puzzles are a staple of textbook exercises, brainteaser collections, and various […]
- Math
Coins for Making Change Efficiently
The item I had just bought cost 29 cents. I gave the cashier a dollar bill, and she gave me two quarters, two dimes, and a penny in change. She could just as well have given me seven dimes and a penny or some other combination of coins adding up to 71 cents, but there’s […]
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19320
This article could have been a little less disingenuous. It would still have been a very good article if you had used “sulfuric acid” instead of “odorless hydrogen sulfate” and admitted that the process still required a little alkali to neutralize this waste stream that is “carried away by water trickling over the foam.” Jim […]
- Tech
A Breath of Fresh Air: Bacteria rid sewage of its stink
Wastewater-treatment plants can use hydrogen sulfide-degrading bacteria instead of chemicals to reduce odors.
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Harvesting Intelligence: IQ gains may reach rural Kenya’s kids
Researchers say they've uncovered a dramatic IQ increase among Kenyan children over a recent 14-year period that may be due to environmental factors such as better nutrition and a greater parental emphasis on schooling.
- Health & Medicine
Preeclampsia Progress: Blood test for predicting pregnancy problems
A natural compound called asymmetric dimethylarginine (ADMA) may play a role in preeclampsia, a pregnancy complication.
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19319
Your article says, correctly, that our research group performed ultrasound of the main blood vessel of the women’s arms as a measure of vessel-cell function throughout the body. However, we identified women at risk of preeclampsia by performing ultrasound tests to assess blood-flow restriction of arteries in the uterus during the second trimester of pregnancy. […]
- Materials Science
Nanofluid Flow: Detergents may benefit from new insight
Fluids containing nanoscale particles spread and readily lift oil droplets off a surface.
- Paleontology
Winging South: Finally, a fly fossil from Antarctica
A tiny fossil collected about 500 kilometers from the South Pole indicates that Antarctica was once home to a type of fly that scientists long thought had never inhabited the now-icy, almost insectfree continent.
- Earth
Farm Harm: Ag chemicals may cause prostate cancer
On-the-job exposure to certain agricultural chemicals may be responsible for farmers' high rates of prostate cancer.
- Astronomy
Starry View: Image reveals galaxy’s violent past
The most detailed visible-light picture ever taken of the heavens reveals that the nearby Andromeda galaxy has had a much more violent history than our own Milky Way has.
