9/3/2005:

Intermediate Word:  montage (a) artistic picture arrangement  (b) mounting for an artillery piece  (c) mountain-studded terrain  (d) summary review of a speech
Difficult Word: - kvetch (a) New Zealand marsupial disease  (b) hobble for Mongolian ponies  (c) fermented mare's milk  (d) chronic complainer

Blogs: More powerful than a lithium  - C/Net  Fuel cell developer UltraCell has come up with a new fuel cell power source for portable electronic devices that it says has twice the energy density of lithium batteries. That's potentially very good news for power-hungry mobile gadgeteers. UltraCell's reformed methanol fuel cell, or RMFC, technology uses a micro reformer to generate fuel-cell-ready hydrogen from a highly concentrated methanol solution. The new portable power system has the density of a hydrogen fuel cell but uses readily available, low-cost methanol fuel in a compact package. The UltraCell 25, which is designed to provide up to 25 watts of continuous power to consumer electronic devicesis an extension of an UltraCell prototype the company created for the military.  The UltraCell25 will be available in 2006 for professional, industrial and mobile-computing applications. It weighs 40 ounces and is about the size of a paperback novel. The system's spent fuel canisters can be instantly "hot swapped".   
Meteor Dust Could Affect Climate - SpaceDaily  A space boulder that disintegrated in a fiery descent over Antarctica last year has sparked a theory that meteor dust may play a hidden role in our climate system. The rock, estimated at 1,000 tonnes, entered the upper atmosphere above Antarctica last September 3, becoming a fireball spotted by the infrared eyes of US defence satellites, a study published on Thursday says. The finding is significant, because large quantities of dust are dumped in Earth's atmosphere from tiny pieces of asteroid rubble or debris left by passing comets, although no-one knows for sure how much is deposited. Their relatively large size helps them to reflect the Sun's rays, thus creating a local cooling effect, and also provides a nucleus for attracting atmospheric moisture -- they encourage clouds to form.   

New Look At DNA Hints At Origin Of Ultraviolet Damage - SpaceDaily  Chemists at Ohio State have overturned ideas about genetic mutation that originated decades ago. In the current issue of the journal Nature, Bern Kohler and his colleagues report that DNA dissipates the energy from ultraviolet (UV) radiation in a kind of energy wave that travels up the edge of the DNA molecule, as if the energy were climbing one side of the helical DNA "ladder." It also counters what scientists proposed in the 1960s: that UV causes mutations by damaging the bonds between base pairs the horizontal "rungs" on the ladder. The new study shows that UV energy moves vertically, between successive bases. If UV damage is confined to one side of the DNA double helix or the other, then the undamaged side makes an easy template for the proteins to follow. But if both sides of a strand were damaged, then the template would effectively be missing.   




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