What Time Is It

What Time Is It, Daylight saving time doesn’t save energy — quite the opposite. Back in World War I, when Germany, Russia, and England first adopted daylight saving, the idea was to conserve coal for the war effort. (The United States eventually followed suit in 1918.) If these countries could just stretch out the daylight during the summer, leaders reasoned, then people would use less electricity for lighting. Sounds sensible, right? The problem is that daylight saving no longer seems to be effective on this score.

Here’s a raft of studies on the subject. Most of them find that while households do use less lighting during daylight saving, thanks to the longer, brighter afternoons, they also end up cranking up the air conditioning more, which makes it either a wash or a net loser for energy use. A 2008 paper (pdf) by economists Matthew Kotchen and Laura Grant examined what happened in Indiana when, thanks to a change in state law, all counties suddenly had to shift to daylight saving. They concluded that daylight saving probably costs Indiana about $10.7 million to $14.5 million per year in higher electricity bills and increased coal pollution.

Meanwhile, daylight saving doesn’t seem to impact gasoline use and driving habits one way or the other. Back in 2005, Congress decided to extend daylight saving by four weeks, claiming it would reduce oil use by 1 percent. A subsequent review (pdf) in 2008 by the Department of Energy found that the legislation didn’t appear to have any effect on gasoline consumption at all.

2) Daylight saving time might increase traffic fatalities. There’s also some dispute about whether daylight saving time increases or decreases traffic accidents. On the one hand, the extra hour of sunshine in the afternoon means that more people are driving while it’s still light out. That makes the roads safer, according to a 1995 study (pdf) in the American Journal of Public Health. On the other hand, the sleep disruptions that occur when clocks are moved forward can increase the risk of traffic fatalities during the spring. Back in 1996, researcher Stanley Coren found that traffic accidents flare up in the spring, when we set our clocks forward and everybody’s tired, and drop again in the fall, when we set our clocks back and get an extra hour of sleep.

3) Daylight saving can be bad for your health. Again, some mixed results here. The extra sunlight is good for vitamin D synthesis. But the disruption in sleep patterns caused by setting your clock forward can actually kill people. Here’s the finding reported in a brand new study out of the University of Alabama in Birmingham: “The Monday and Tuesday after moving the clocks ahead one hour in March is associated with a 10 percent increase in the risk of having a heart attack,” says researcher Martin Young. And a 2009 study (pdf) in the Journal of Applied Psychology found that tired workers are at greater risk of workplace accidents.

4) Daylight saving has mixed effects on the economy. Retailers love the extra sunlight — it means that there are more customers around who are willing to go out and shop. The all-powerful golfing industry is also a big fan, apparently. On the other hand, daylight saving can cut into sales for movie theaters and reduce the audience for prime-time television — people go out and enjoy the evening air instead of staring at screens inside.

Hiv Vaccine

Hiv Vaccine ,  Aids Vaccine, In a first, an experimental vaccine was found to reduce the likelihood of contracting HIV.

It’s very far from 100% effective. Based on a trial of 16,000 participants, incidents of contracting the virus fell 31%, but that’s much more significant than has been seen in any past trials.

WSJ: The study actually tested a two-vaccine combo in a “prime-boost” approach, where the first one primes the immune system to attack HIV and the second one strengthens the response.

They are ALVAC, from Sanofi Pasteur, the vaccine division of French drug maker Sanofi-Aventis; and AIDSVAX, originally developed by VaxGen Inc. and now held by Global Solutions for Infectious Diseases, a nonprofit founded by some former VaxGen employees.

ALVAC uses canarypox, a bird virus altered so it can’t cause human disease, to ferry synthetic versions of three HIV genes into the body. AIDSVAX contains a genetically engineered version of a protein on HIV’s surface. The vaccines are not made from whole virus — dead or alive — and can’t cause HIV.

Neither vaccine in the study prevented HIV infection when tested individually in earlier trials, and dozens of scientists had called the new one futile when it began in 2003.

Obviously, one trial is just the beginning of what will probably be years of development before this turns into anything that is deemed worthwhile and scalaable. Still, it’s exciting news. Watch shares of Sanofi (SNY) to move today.

Source : http://www.businessinsider.com/first-ever-effective-hiv-vaccine-announced-2009-9