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For Energy Savings, LEDs Outshine Solar Panels

Homeowners looking to save electricity costs should replace all their incandescent light bulbs with LED-based lights instead of installing a small solar photovoltaic system, a report by J.P. Morgan shows. Light-emitting diodes, or LEDs, will become mainstream over the next 12 months as improving technology and performance and higher subsidies lead to a rapid drop in costs, according to the report

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Powerful Hurricane Irene Churns toward Southeast U.S.

By Manuel Jimenez SANTO DOMINGO (Reuters) - A strengthening Hurricane Irene churned on a northwest track toward the Southeast United States on Tuesday, threatening the Turks and Caicos Islands and the Bahamas with battering winds and rain and dangerous surf. [More]

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System Analysis and Programming

A note from the Editor in Chief: Scientific American is celebrating its 166th year. Given its history as the longest continuously published magazine in the U.S., it's probably no surprise that it has touched the lives and career paths of many readers--including the scientists who write articles for us and whose work we cover. So, as often happens, when I met Peter Norvig, director of research for Google, while we were serving as judges for the Google Science Fair , we got to chatting about Scientific American

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Cocaine’s Newest Risks: Dying Skin and Compromised Immunity

To the list of cocaine’s many dangers, health officials have added at least one more: purpura, a rash caused by internal bleeding from small blood vessels. Two recent papers in major medical journals have documented cases of cocaine users showing up in emergency rooms with patches of blackened, dying skin on the ears, face, trunk or extremities. The condition causes scarring and sometimes requires reconstructive surgery.

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Hubble Telescope Successor Could Get a Financial Lifeline

From Nature magazine The James Webb Space Telescope (JWST) is perilously overbudget and under threat of cancellation, but Naturehas learned that it may be offered a financial lifeline. The flagship observatory is currently funded entirely through NASA's science division; now NASA is requesting that more than US$1 billion in extra costs be shared 50:50 with the rest of the agency. The request reflects administrator Charles Bolden's view, expressed earlier this month, that the telescope is a priority not only for the science programme, but for the entire agency.

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Our Flooded Future Looms [Slide Show]

The future looks warmer for many major cities, that's clear--but perhaps you missed the part where it's also forecast to look wetter. Scientific measurements show that the quantity of rainfall that fell on the Northern Hemisphere intensified in the second half of the 20th century. At least some of that increase can be attributed to anthropogenic climate change, according to a recent study .

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Are Category 6 Hurricanes Coming Soon?

Atmospheric researchers tend to agree that tropical cyclones of unusual ferocity are coming this century, but the strange fact is that there is no consensus to date on the five-point scale used to classify the power of these anticipated storms. In what may sound like a page from the script of the rock-band spoof Spinal Tap with its reference to a beyond-loud electric guitar amplifier volume 11, there is actually talk of adding a sixth level to the current Saffir-Simpson hurricane scale, on which category 5 intensity means sustained winds higher than 155 miles per hour (250 kilometers per hour) for at least one minute, with no speed cap

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Molars Say Cooking Is Almost 2 Million Years Old

Most large animals have to chew food extensively and form it into a mushy ball that’s easy to swallow. Cooking makes a huge difference--it softens the food and dramatically reduces eating time.

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Signal for Higgs Particle Grows Weaker in Latest Data

By Geoff Brumfiel of Nature magazine The Higgs boson , the most sought-after particle in all of physics, is proving tougher to find than physicists had hoped. Last month, a flurry of "excess events" hinted that the Higgs could be popping up inside the Large Hadron Collider (LHC), the world's most powerful particle accelerator located at CERN, Europe's high-energy physics lab near Geneva, Switzerland.

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