EarthCan oil from tar sands be cleaned up? Canadian tar sands contain the world's second-largest reserves of oil, but extracting it is a filthy process. Bacteria and steam may help to clean it up ¿ìè¶ÌÊÓÆµ
Review: The Open Laboratory edited by Jennifer Rohn Blogs bring a lively, personal feel to science, but they won't replace journalism just yet Books & Arts