Submersible GPS and Mobile sign language

Source: New Scientist It is a little-known fact that GPS does not work under water. A newly-patented system uses a tethered base station with a known GPS location that responds to a special sonar pulse. Triangulation of the return times from several base stations gives an approximation of the submarine's GPS coordinates.

Source: New Scientist Military scientists have developed a new type of torpedo that explodes without explosives. Normally the heat from the engine is dissipated, but in proposed design the heat is used to turn aluminum metal into molten metal. The impact ruptures the titanium shell and releases the molten metal into the water where a thermal explosion takes place as the water instantly turns to steam and expands. As the metal cools it becomes shrapnel that does further damage to the target.

Source: Sunday Telegraph Ok, it's one thing to disagree with scientists who don't hold the same view, but threatening them. This is precisely what is happening to some climate scientists who do not support the theory of global warming. A University of Winnipeg climatologist has received five death threats as a result of his stand on global warming. Now, I disagree with his, and other climatologists statements that global warming is a fraud, but they should be able to voice their opinion without fear for their lives. Different opinions, even those radically opposed to each other, are the cornerstone of healthy science. If they are wrong, then the facts will eventually favour those who are correct.

Source: PhysOrg MobileSign.org is a video dictionary of 5,000 words in British Sign Language, designed to be accessible via cell phone. The free service is designed to help parents of deaf children by allowing them to look up the sign for a word. The service can be found at www.mobilesign.org for those of you who might benefit.

Source: Scientific American A recent study has discovered that signals indicating the body's fat level can become suppressed. As a result, it ceases to adjust appetite and activity level to compensate for growing fat stores. It is hoped that future research will yield a way to re-sensitize the brain to the level of fat stored by the body as a way to combat obesity. In particular, people, most often those who consume a high-fat diet, can develop a desensitivity to leptin, a hormone that indicates the level of fat in their body. Obese people have high leptin levels, but it is theorized that their brains no longer adjust appetite in response to leptin levels. This may provide a way to treat obesity by resensitizing the brain to leptin.