A five-year-old boy recovering from cancer became a superhero for a day, as San Francisco transformed itself into Gotham City.<img src="http://feeds.feedburner.com/~r/DiscoveryNews-Top-Stories/~4/eJPLkGJc7Lc" height="1" width="1"/>
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A five-year-old boy recovering from cancer became a superhero for a day, as San Francisco transformed itself into Gotham City.<img src="http://feeds.feedburner.com/~r/DiscoveryNews-Top-Stories/~4/eJPLkGJc7Lc" height="1" width="1"/>