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1.
Rainwater Harvesting to Replenish Underground Water in Rajasthan, India (ecotippingpoints.org)
94 points by grok2 167 days ago | 6 comments
2.
$19 postage stamp-sized Wi-Fi module for interacting with physical things (spark.io)
17 points by grok2 295 days ago | 4 comments
3.
Ask PG: Need link next to "Unknown or expired link."
10 points by grok2 1407 days ago | 5 comments

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