Magnesium aids in bone development.
There are thousands and thousands of blogs out there... At least one for every conceivable interest - take, for instance, the news today that London's Northern Line trains will stop running as the drivers have gone on strike because of repeated unresolved technical problems. Fair enough, but what if you're a rail nut and you want the skinny on what 'technical problems' really means? Easy. Surf on over to "District Drivers Logbook", a blog written by a driver on London's District Line, and get your answer. Awesome.
The Morning News has an interview with Douglas Levere, the photographer behind "New York Changing", a collection of photographs that follow Berenice Abbott's 1930's work on NYC, mimicking the locations and angles, only 60 years later. There's also a good selection of the photographs.