30/08/2012

Spacewalking astronauts stymied by sticky bolts

(AP)—Sticky bolts proved too much for spacewalking astronauts Thursday, forcing them to leave a new power-switching box dangling from the International Space Station instead of bolted down.

Jupiter-bound spacecraft makes key maneuver

A Jupiter-bound spacecraft successfully fired its engine Thursday in the first of two crucial maneuvers intended to bring it toward Earth for a momentum-gathering fly-by.

'Promiscuous' enzymes still prevalent in metabolism

Open an undergraduate biochemistry textbook and you will learn that enzymes are highly efficient and specific in catalyzing chemical reactions in living organisms, and that they evolved to this state from their "sloppy" and ...

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