Intermediate Word:  sinter (a) grain measure  (b) to skim off scum on molten metals  (c) to fuse to a loosely bound aggregate  (d) ceremonial ablutions before a coronation
Difficult Word:
  trave-  (a) section of ceiling formed by crossbeams  (b) handfast oath  (c) V-shaped carrier in which brick layer carries his tools  (d) drip-rail around the bottom of a cornice

Searching for the fountain of youth  - Technology Review   For the better part of two decades, Richard Weindruch at the University of Wisconsin-Madison, has fed half of a colony of 78 rhesus monkeys a diet adequate in nutrition but severely limited in calories -- 30 percent fewer calories than are fed to the control group. 80 percent of them still alive, "there are too few deaths" to indicate whether the animals on the restricted diet will live long. But one thing is already clear: the restricted monkeys are healthier.     
X-Rays Reveal 250,000 Tonnes Of Water Released By Deep Impact - SpaceDaily  Left: NASA's Deep Impact spacecraft slammed a 300-pound bronze impactor into Comet Tempel 1 last July 4, apparently releasing a great deal of water vapor. Image credit: NASA/JPL-Caltech/UMD  Observations by the Swift spacecraft of the collision last July 4 between Comet Tempel 1 and a probe released by NASA's Deep Impact mission showed the comet grew brighter and brighter in X-ray light, in an outburst that lasted 12 days and released about 250,000 tons of water. "The Swift observations reveal that far more water was liberated and over a longer period than previously claimed," said research team leader Dick Willingale of the University of Leicester. The X-rays were created by the newly liberated water lifted into the comet's thin atmosphere and illuminated by the high-energy solar wind from the Sun.   

'More genes' needed to make life  - BBC  Left:  The researchers used E. coli as the basis for their analyses.  Scientists trying to make artificial life forms in the lab may have more work ahead of them than they thought. The simplest life forms could require twice as many genes to survive than was previously believed, a research team claims in the journal Nature. "The surprise was the metabolism got to be really rather larger than people had suggested the smallest metabolism could be>. A US research team created the world's first synthetic virus in 2002, but scientists are divided about whether viruses are, strictly speaking, alive. 

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