Intermediate Word: 
  (a) diacritical apostrophe  (b) briefcase  (c) monetary symbol  (d) summary
Difficult Word: - dragoman   (a) local leader of an infantry charge  (b) type of damson fly  (c) Turkish guide  (d) medieval blunderbuss

Terraforming Mars: Experts Debate How, Why and Whether - Space.com  At the Astrobiology Science Conference earlier this year, scientists and science fiction writers -- from NASA researcher Chris McKay to author Kim Stanley Robinson -- faced off on the promises and pitfalls of terraforming Mars. Their debate is recreated in these seven pages. The Mars Terraforming Debate was co-sponsored by NASA's Astrobiology Magazine, the SciFi Museum (Seattle), and Breakpoint Media. It is reproduced here in cooperation with Astrobiology Magazine.  
Mercury, Nasa Mercury rising: Space probe's chief scientist explains the planet's attraction   - BBC  Although temperatures can reach 450C, scientists think there may be ice at the poles. Principal investigator Sean Solomon told BBC News Online about some of the questions he wants to answer about this enigmatic planet. In the last two decades, ground-based astronomy has discovered other elements in Mercury's atmosphere including sodium, potassium and calcium, which have to be derived from the surface. Radar astronomy also discovered Mercury's polar deposits, which are bright at radar wavelengths. The leading hypothesis is that they consist of water ice.

Chimneys at a power station

Acid rain 'might curb warming'  - BBC  Acid rain might not be entirely harmful: the sulphate it contains might be helping to slow down global warming, scientists have announced. The greenhouse gas methane is produced in large quantities by microbes found in wetlands such as peats and marshes. But these microbes are inhibited by a type of bacteria that thrives on the sulphate present in acid rain. In time, this could return methane to pre-industrial levels, Proceedings of the National Academy of Sciences says. Methane is a powerful greenhouse gas, but it exists in much smaller quantities than carbon dioxide; it accounts for 22% of human-caused global warming.

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