A couple of months ago, we wrote about a remarkable online “fish doorbell” or visdeurbel that allows spawning fish to swim through the canals of Utrecht in the Netherlands unobstructed by the Weerdsluis lock. The system is comprised of an internet-connected underwater camera … [Read more...] about Update: Holland’s fish doorbell is a worldwide hit!
affordable geothermal heating
Millions of US citizens still use oil and natural gas to heat their homes during the winter. Many would like to switch to geothermal, a cleaner and ultimately cheaper system that leverages the natural temperature of the earth. … [Read more...] about How Dandelion is making geothermal heating affordable