Curved Laser Beams Could Help Tame Lightning
Urchin writes “Laser beams just gained a new property — they can curve through space. That’s what happens when ultrashort laser pulses pass through a phase pattern mask and a lens, which together shift the most intense region of the beam from the center to the right-hand side. The asymmetry in the pulse causes it to drift progressively further to the right along an arc as it travels. The laser beam is so intense that it ionizes the air it passes through to create a curved plasma channel. Those kinds of channels can be up to 100 meters long — direct them at thunderclouds and they could first trigger lightning to spark and then act as a convenient but short-lived lightning rod to guide it safely to the ground, according to some researchers.”
Read more of this story at Slashdot.
Grief-stricken relative questions Afghan mission – Globe and Mail
![]() CTV.ca |
Grief-stricken relative questions Afghan mission
Globe and Mail TORONTO AND KANDAHAR, AFGHANISTAN – Trooper Karine Blais expected to buy a house with her boyfriend when she returned from Afghanistan in the fall. Medicine Hat, Alta., to stand in as Kandahar for Canadian troops … The Canadian Press Fallen soldier's casket begins journey to Canada CBC.ca Canoe.ca – Vancouver Sun – Toronto Star – CBC.ca all 460 news articles Langue : Français |
CSIS director to retire in June – Toronto Star
![]() Globe and Mail |
CSIS director to retire in June
Toronto Star OTTAWA–In a surprise move, the head of Canada's spy agency is stepping down after just over four years in the job. The decision was confirmed by an official with the Canadian Security Intelligence Service Tuesday night. Canada a target of espionage due to NATO ties AFP all 15 news articles |
Pirates Fail in Attack on US Ship – New York Times
![]() ABC News |
Pirates Fail in Attack on US Ship
New York Times By MARK McDONALD HONG KONG – An American cargo ship was attacked by pirates armed with grenade launchers and automatic weapons in the Gulf of Aden on Tuesday, but the attackers failed to take over the ship, which was able to continue with its delivery … Video: Somali Pirates Hijack 4 Ships, Take 60 Hostages The Associated Press US ship attacked by Somali pirates Xinhua Aljazeera.net – CBC.ca – The Associated Press – Bloomberg all 17,641 news articles Langue : Français |
The PostRank Newsroom: Twitter For High-Value Information
Imagine a system for delivering only high-value information via Twitter. That’s what PostRank has built with its new PostRank Twitter Newsroom. The system finds the most engaging blogs on various topics, then automatically pulls the most talked-about posts from those blogs and now delivers those links to you via Twitter.


