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How to Escape Quicksand? on 2009-05-29
Nine Notable Uses for Social Bookmarking on 2009-05-29
Why does HydrogenPeroxide Foams when You Put It on a Cut? on 2009-05-27
- The reason why it foams is because blood and cells contain an enzyme called catalase. Since a cut or scrape contains both blood and damaged cells, there is lots of catalase floating around.
- When the catalase comes in contact with hydrogen peroxide, it turns the hydrogen peroxide (H₂O₂) into water (H₂O) and oxygen gas (O₂).
  
  2H₂O₂ --> 2H₂O + O₂
How Impact Grenades Work? on 2009-05-27
- Impact grenades work like a bomb launched from an airplane -- they explode as soon as they hit their target. Typically, soldiers don't throw impact grenades as they would a time-delay grenade. Instead, they use a grenade launcher to hurl the grenade at high speed.
- In one conventional gun-mounted launcher design, grenades are propelled by the gas pressure generated by firing a blank cartridge. Some launcher grenades have their own built-in primer and propellant.
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- - Like missiles, these grenades have a built-in rocket propulsion system.
  - Impact grenades must be unarmed until they are actually fired because any accidental contact might set them off. Since they are usually shot from a launcher, they must have an automatic arming system. In some designs, the arming system is triggered by the propellant explosion that drives the grenade out of the launcher. In other designs, the grenade's acceleration or rotation during its flight arms the detonator.
  - When the grenade is unarmed, the fuze mechanism is positioned toward the tail end, even though it has a spring pushing it toward the nose. It is held in this position by several spring-mounted, weighted pins. The firing pin is not long enough to reach the percussion cap when the fuze is in this position. If the trigger plate is pressed in accidentally, the pin will slide back and forth in the air, and nothing will happen.
  - When the grenade is fired it begins to spin (like a well-thrown football). This motion is caused by the shape and position of the fins, as well as spiraled grooves inside the barrel of the grenade launcher.
    
    The spinning motion of the grenade generates a strong centrifugal force that pushes the weighted pins outward. When they move far enough out, the pins release the fuze mechanism, and it springs forward toward the nose of the grenade. When the grenade hits the ground, the nose plate pushes in, driving the firing pin against the percussion cap. The cap explodes, igniting the detonator explosive, which ignites the main explosive.
How Time-Delay Grenades Work? on 2009-05-27
- The most common type of grenade on the battlefield is the time-delay fragmentation anti-personnel hand grenade. The primary function of this grenade is to kill or maim nearby enemy troops. To ensure maximum damage, the grenade is designed to launch dozens of small metal fragments in every direction when it explodes.
- The conventional design uses a simple chemical delay mechanism.
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- - The firing mechanism is triggered by a spring-loaded striker inside the grenade. Normally, the striker is held in place by the striker lever on top of the grenade, which is held in place by the safety pin. The soldier grips the grenade so the striker lever is pushed up against the body, pulls out the pin and then tosses the grenade. Here's what happens inside once the grenade is released:
    
    With the pin removed, there is nothing holding the lever in position, which means there is nothing holding the spring-loaded striker up. The spring throws the striker down against the percussion cap. The impact ignites the cap, creating a small spark.
    
    The spark ignites a slow-burning material in the fuze. In about four seconds, the delay material burns all the way through.
    
    The end of the delay element is connected to the detonator, a capsule filled with more combustible material. The burning material at the end of the delay ignites the material in the detonator, setting off an explosion inside the grenade.
    
    The explosion ignites the explosive material around the sides of the grenade, creating a much larger explosion that blows the grenade apart.
    
    Pieces of metal from the outer casing fly outward at great speed, imbedding in anybody and anything within range. This sort of grenade may contain additional serrated wire or metal pellets for increased fragmentation damage.
What are the Differences between the Size of CD and Mini CD? on 2009-05-26
- Standard CDs have a diameter of 120 mm and can hold up to 80 minutes of audio (700 MB of data).
- The Mini CD has various diameters ranging from 60 to 80 mm; they are sometimes used for CD singles or device drivers, storing up to 24 minutes of audio.
Pixlr: Online Image & Photo Editor on 2009-05-26
eHow: How to Do Just About Everything! on 2009-05-25
What are the Symptoms of Computer Infection? on 2009-05-25
- There are a number of symptoms which indicate that your computer has been infected. If you notice "strange things" happening to your computer, namely:
  
  unexpected messages or images are suddenly displayed
  unusual sounds or music played at random
  your CD-ROM drive mysteriously opens and closes
  programs suddenly start on your computer
  you receive notification from your firewall that some applications have attempted to connect to the Internet, although you did not initiate this,
  then it is very likely that your computer has been infected by a virus
- Additionally, there are some typical symptoms which indicate that your computer has been infected via email:
  
  your friends mention that they have received messages from your address which you know you did not send
  your mailbox contains a lot of messages without a sender's e-mail address or message header
  
  These problems, however, may not be caused by viruses. For example, infected messages that are supposedly coming from your address can actually be sent from a different computer.
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- - There is a range of secondary symptoms which indicate that your computer may be infected:
    
    your computer freezes frequently or encounters errors
    your computer slows down when programs are started
    the operating system is unable to load
    files and folders have been deleted or their content has changed
    your hard drive is accessed too often (the light on your main unit flashes rapidly)
    Microsoft Internet Explorer freezes or functions erratically e.g. you cannot close the application window
  - 90% of the time the symptoms listed above indicate a hardware or software problem. Although such symptoms are unlikely to be caused by a virus, you should use your antivirus software to scan your computer fully.
ScienceDaily.com on 2009-05-25

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