http://netvouz.com/pdboyer/tag/nytimes?feed=rss pdboyer's bookmarks tagged "nytimes" on Netvouz http://learning.blogs.nytimes.com/2011/04/06/will-it-happen-again-examining-mass-extinctions-on-earth/?nl=learning&emc=learninga1 Overview | What is a mass extinction, and why do some scientists think human beings may be responsible for the next one? What do we know about the past extinctions, including their likely causes? In this lesson, students learn about mass extinctions, map extinction events to a geologic timeline, and explore current ideas about whether human influences may lead to another major extinction event. pdboyer Thu, 07 Apr 2011 00:35:59 GMT http://learning.blogs.nytimes.com/2010/04/21/ten-ways-to-go-green-and-mark-earth-day/?nl=learning&emc=a1 The Learning Network Blog - NYTimes.com pdboyer Sat, 24 Apr 2010 18:31:54 GMT