In the March 24 "Green Lantern" about microwaves and ovens, Nina Shen Rastogi did not provide a clear explanation of why gas ovens might be preferable to electric ovens from an efficiency standpoint. There are significant energy losses associated with generating electricity and transmitting it to your home.

In the March 24 "Today's Papers," Daniel Politi attributed a quote from a spokeswoman for the American Nurses Association to the head of that organization.

In the March 23 "Technology," Farhad Manjoo stated that Facebook's new activity stream forces people to listen to conversations from everyone in their network. You can filter your stream according to groups of friends.

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