New Ways to Make a Difference

If you've got at least five minutes, five dollars or five friends, here are some ways to do some good

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Put Your Time to Work
• For anyone with a jammed schedule, a new group called the Extraordinaries offers ways to devote even just a few minutes of free time to something worthwhile. Micro-volunteering opportunities abound on BeExtra.org, from using your smartphone to view and label photos (to help digitize museum archives) to snapping a picture of a local park (to help build a map of places where kids can play).

• Another new tool aims to break world-changing action into its tiniest subparts. IfWeRantheWorld.com, which expects to launch this fall, encourages you...