TRUE AGE REVEALED IN TOOTH ENAMEL
LONDON, Sept 14 (Reuters) - Tests of nuclear bombs conducted in the 1950s have had an unexpected
benefit for forensic scientists.
A permanent record of the fallout from above-ground tests is embedded in tooth enamel and allows
scientists to estimate the age of a person at the time of death more precisely.
Jonas Frisen, of the Karolinska Institute in Stockholm, who developed the method, said it has already
been used to help identify people who died in the Indian Ocean tsunami last year.
COCAINE-LINKED MEMORIES MIGHT BE ERASED
from HealthDay News
In research with rats, scientists showed they can selectively disrupt memories associated with cocaine use
-- a finding that may help in the development of new ways to fight addiction.
While the actual high of cocaine and other drugs is one reason that addicts crave drugs and suffer relapses,
addicts also have powerful memory associations linked to their drug experiences. Researchers believe that
by removing those memory associations, it may be possible to improve treatment.
In two studies published in the Sept. 15 issue of the journal Neuron, researchers from the United Kingdom
and the United States report that they were able to selectively eliminate rats' memory associations
connected with receiving cocaine.
CAREFUL OR THEY'LL HEAR YOUR PASSWORD
from The Boston Globe (Registration Required)
Computer scientists at the University of California at Berkeley have found a new way to crack computer
passwords: By listening.
Professor Doug Tygar and graduate student Li Zhuang use off-the-shelf microphones to record keystroke
sounds and run the noise through a modified program originally designed to recognize human speech. On
its first pass, the program correctly identifies only half the typed letters. The results are then fed through
software that spots spelling and grammar errors. Data from these programs are used to train the keystroke
recognizer, so that it gets more accurate with each pass. By the third run, ''we get 96 percent of
all the characters," said Tygar.
Tygar said that when assigned to crack a 10-digit password, the software replies with 75 possibilities.
''This means we can break into one of every 75 people's accounts, on the first try," he said.