Intermediate Word: 
  (a) Irish clan (b) group of seven  (c) traveling band of seven minnesingers   (d) dividing membrane 
Difficult Word: - gaur  (a) bridge on ukelele  (b) a member of the leek family  (c) African antelope  (d) bovine Southeast Asian mammal

Harnessing the Power of Poop - Space.com   On a two-year trip to Mars, according to one estimate, a crew of six humans will generate more than six tons of solid organic waste--much of it feces. So what do you do with all that? Right now, astronaut waste gets shipped back to Earth. But for long-term exploration, you'd want to recycle it, because it holds resources that astronauts will need. It will provide pure drinking water. It will provide fertilizer. And, with the help of a recently discovered microbe, it will also provide electricity
Diane Kruger Ancient dig: Is the story of Troy just a fantastic work of fiction?  - BBC  No document from the period has ever mentioned a Helen of Troy, or an Achilles, but these writings mention an individual called Alexandros - an alternative version of the name Paris. While Paris may have been a real person, it remains doubtful that his city descended into war over his desire for Helen - the strategic position of Troy on the main trade routes between East and West is a far more likely explanation. Professor Rose said: "If a war was fought over Troy, it was much more likely to be for money and power rather than love."

Nanoparticles, American Physiological Society

Claim made for new form of life  - BBC  Left:  The evidence is suggestive of life forms.  The existence of nannobacteria is one of the most controversial of scientific questions - some experts claim they are simply too small to be life forms. But US scientists report they have now isolated these cell-like structures in tissue from diseased human arteries. Previous research carried out by Jack Maniloff of the University of Rochester in New York has shown that to contain the DNA and proteins it needs to function, a cell must be a minimum of 140nm across. "if you go back to how we defined life prior to our knowing about DNA, our criterion was that things multiplied in culture."

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