Intermediate Word: 
  (a) low-grade brownish-black coal  (b) wood substitute  (c) principal constituent of trees  (d) a type of resin 
Difficult Word: - usufruct  (a) the right to use other's property if not damaging  (b) a long-handled tree-trimmer  (c) to sequester unlawfully  (d) to create a hybrid by grafting

A Bit Of Titan On Earth Helps In The Search For Life's Origins - SpaceDaily  Scientists suspect that organic solids have been falling from Titan's sky for billions of years and might be compounds that set the stage for the next chemical step toward life. They collaborate in University of Arizona laboratory experiments that will help Cassini scientists interpret Titan data and plan a future mission that would deploy an organic chemistry lab to Titan's surface. Chemists in Mark A. Smith's laboratory at the University of Arizona create compounds like those condensing from Titan's sky by bombarding an analog of Titan's atmosphere with electrons.
Image of meat Scientists endorse Atkins diet  - BBC  Following a low-carbohydrate, high-protein diet is a more effective way to lose weight than following a low fat diet, say US researchers. The Atkins dieters lost more body fat, lowered their triglyceride levels and raised their "good" HDL cholesterol levels more than the low-fat dieters. However, the research was funded by the Robert C Atkins Foundation. And critics say there are still serious doubts about the long-term effect on health of adopting such diets. Also, over 12 months both low-fat and low-carb dieters lost similar amounts of weight.

One of the GoFast rocket's previous attempts to blast into space

Amateur rocket fired into space  - BBC  The Civilian Space eXploration Team's 6.5m (21ft) GoFast rocket is understood to have exceeded an altitude of 100km. "It is a fantastic achievement," Richard Osborne, from the Mars rocketry group, told BBC News Online. "I have been in Nevada with them during their previous attempts. It is a very impressive team." A 14-second burn allowed the rocket to reach an altitude of more than 100km - the official boundary of space - in about three minutes. Eric Knight said the team had detected the payload's telemetry beacon but had not yet reached it.

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