Ash may hover for days over uncertain Europe

(AP) -- The Icelandic volcano that has kept much of Europe land-bound is far from finished spitting out its grit, and offered up new mini-eruptions Saturday that raise concerns about longer-term damage to world air travel ...

Hydrogen still in the eco-car race

(AP) -- Hydrogen, one of Earth's most abundant elements, once was seen as green energy's answer to the petroleum-driven car: easy to produce, available everywhere and nonpolluting when burned.

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