Looking back one, two and five years ago today (give or take!) on Worldchanging:

2009
Kenyas' First "Net Positive" Basketball Court
Christa Morris reports on Architecture for Humanity's "net-positive Rainwater Court" project at the new Mahige Hope High School in Kenya...

2008
Preview: Curry Stone's Five Finalists in Humanitarian Design
Julia Levitt shares images and descriptions of the top five finalists for the The Curry Stone Design Prize...

2005
Generation Fabrication
Jamais Cascio reflects on the growth of DIY and digital technologies that make home fabrication competitive with the output of major companies...

Other recent "look backs":
September 9
September 10
September 13