Stepping off the planet.

New forms of displayed imagery within this planetary "Art of destruction". The pace of work is not quite light-speed. But the end product may be just that -- an orbiting laser that churns out a high-power beam to destroy a ballistic missile in flight by 2013. Industry and government teams are now shaping the Space-Based Laser (SBL) concept. The idea is seen as next-generation directed-energy weaponry, whereby dozens of space platforms would be interlinked to create an Earth-orbiting global missile defense system. This laser yet a more potent meteor deflecting system. "This is an ambitious project. Everybody should understand that," said Colonel Neil McCasland, director of the Air Force's SBL-IFX project in Los Angeles, California. "But this is a reach that is in the domain of the possible for American industry. The implications are commensurate with the ambition," he told SPACE.com a souped-up cylindrical, hydrogen-fluoride chemical laser is at the heart of the SBL-IFX test satellite. "Basically prove out all the systems, including lighting off the high-energy laser before they actually go after a target," Streland said. Less than a dozen firings of the laser are expected over the equipment's three-year lifetime, McCasland said. Studies are underway for designing the laser for on-orbit refueling, he said. But trying to build an affordable, compact and less-weighty Space-Based Laser is no small task. One key step was recently taken using results of a TRW-built Alpha chemical laser firing last month.
That six-second test shot of the megawatt-class Alpha demonstrated ways to tailor the laser's chemical efficiency and output power, as well as the shape of the light beam. That data is a bonus for the megawatt-class SBL-IFX laser, McCasland said. Well on the way to power craft heat craft and deflect large meteors from earth. Data gleaned from flight testing the SBL-IFX in 2013 will be used by Department of Defense policymakers to wrestle with a go/no-go decision to construct and deploy in orbit a full-scale laser missile defense system. If given the green light, an operational fleet of lasers could be placed in space around (2020).It is important to do tests with laser, as this can prevent meteors from striking the earth it the most efficient way of deflecting large objects from hitting our planet.

Crows on cigarette break.

A crow flew past in Maldives carrying a packet of cigarettes. Tony and Judie Ellis, from Crow borough who were on Holiday, (we're not joking) Sussex, watched in amazement as the crow landed on the roof of a water villa next to theirs and calmly began extracting the cigarettes from the packet.

As Judie, 53, rushed to get her camera to record the scene on the Maldives two more crows arrived for a fag break and picked up the cigarettes in their beaks. Judie said: 'The crow which flew past with the cigarettes seemed to be dishing them out to the others.'It was taking the cigarettes out of the packet and putting them on the roof of the water villa. Then the other crows were picking them up. It was amazing that they seemed to have them in their beaks the right way round.'
The couple, who work as toy inventors, were told after the incident that crows can sometimes be a bit of a nuisance on the islands. They were told that another holidaymaker had a sandwich stolen by a cheeky crow. Judie said: 'We have been to the Maldives four times before but never seen any sort of crow behaviour like that. I was lucky to be able to record this on my camera.'

Microscopic robots.

Art club view discovered Scientists have created microscopic robots out of DNA molecules that can walk, turn and even create tiny products of their own on a nano-scale assembly line. These ground-breaking devices outlined in the journal Nature, could one day lead to armies of surgeon robots that could clean human arteries or build computer components or just assist.In one of the projects a team from New York's Columbia University created a spider bot just four nanometres across. This is about 100,000 times smaller than the diameter of a human hair. Robots of the future could operate at the nano-scale level, cleaning arteries or building computer components The nano-spider moves along a track comprising stitched-together strands of DNA that is essentially a pre-programmed course. The track exploits DNA's double-helix molecule - a structure of four chemicals that are paired in rungs. By 'unzipping' the DNA you end up with a track that can be used rather like the teeth in a clockwork mechanism. A cog can move around the teeth, provided it meshes with them.

By using strands that correspond to sequences in the track, the robot can be made to walk, turn left or right as it is biochemically attracted to the next matching stretch. The spider's 'body' is a common protein called streptavidin. Attached to it are three 'legs' of single-strand enzymatic DNA, which binds to, and then cuts, a particular sequence of DNA. The fourth leg is a strand that anchors the spider to the starting point. Study leader Milan Stojanovic said: 'After the robot is released from its start site by a trigger strand, it follows the track by binding to and then cutting the DNA strands.'

Once the strand is cut, the leg starts reaching for the next matching stretch of DNA in the track. In this way, the spider is guided down the path set by the researchers.
Eventually, the robot encounters a patch of DNA to which it can bind but cannot cut. At that point, it is immobilised. A molecular nanobot dubbed a 'spider' and labeled with green dyes moves along a DNA track to its red-labeled goal. To watch the spider in motion, the researchers used atomic force microscopy which showed the molecular robots following four different paths. Molecular robots have drawn huge interest because of the allure of programming them to sense their environment and react to it. For instance, they could note disease markers on a cell surface, decide that the cell is cancerous and needs to be destroyed and then deliver a compound to kill it. Other DNA walkers have been developed in the past, but they have never ventured more than a few steps, said Hao Yan, a professor at Arizona State University.

Professor Yan said: 'This one can walk about to about 100 nanometers. That's roughly 50 steps.' The next step is how to make the spider walk faster and how to make it more programmable, so that it can follow many commands on the track and make more decisions. In a separate study reported in Nature, Nadrian Seeman and colleagues from New York University said they had built a prototype molecular factory.
They used a number of DNA robots to assemble gold particles in different ways in response to chemical commands.

DNA walkers moved past three kinds of DNA machines that handed them a cargo of gold nano-particles, which are clutched with three 'hands'. 'This is the first time that systems of nano-machines, rather than individual devices have been used to perform operations, constituting a crucial advance in the evolution of DNA technology,' said Lloyd Smith, from the University of Wisconsin at Madison, in a commentary also published by Nature. Nearly £6billion is being invested in research and development of nano products worldwide, according to the Project on Emerging Nanotechnologies, which tracks environmental and health concerns arising from the new technology.

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