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" Airport Holdups Worsen Independence Day aside, the FAA&amp;#039;s flight delay woes don&amp;#039;t look like they&amp;#039;re ending anytime soon. New statistics for the month of May show that airline tardiness worsened for the fifth month in a row, to the point where nearly one out of four flights suffered delays of 15 minutes or more. TECH WATCH: GPS Could Cut Airline Flight DelaysPODCAST: Fighting Summer Travel Headaches  Hortibot Hunts Down Weeds Farmers won&amp;#039;t be trading in their tractors any time soon, but a new machine could be joining them in the field\u2014and it only has a brain. Danish scientists have designed a smart robot that uses GPS to crawl through fields, locate 25 different types of weeds, then automatically spray, torch, laser or pluck them. EARLIER: High-Tech Farming 101LAWN CARE: Keeping Weeds at Bay the Natural Way Irish Company Hypes Perpetual Motion Machine Steorn wouldn&amp;#039;t be the first company to claim it has invented a perpetual motion device that can produce infinite free energy, but it will be the first to put the device on display at London&amp;#039;s Kinetica museum for 10 days, with an open invitation to scientists to come and debunk it. Sadly, the opening of the exhibit has already been delayed due to &amp;quot;technical difficulties,&amp;quot; which often crop up when you attempt to break the laws of physics. LAB TEST: We Debunk Fuel-Saving GizmosGREEN LIVING: Can Pond Goo Power America Scientists Unravel Hyperion&amp;#039;s Mysteries When NASA&amp;#039;s Cassini spacecraft first captured the crater-pocked surface of Hyperion, one of Saturn&amp;#039;s moons, scientists were puzzled by the rock&amp;#039;s spongy appearance \u2013 but not any longer. After estimating Hyperion&amp;#039;s mass and volume, they discovered that its density is only more than half that of water, explaining why debris scars the surface so drastically. EARLIER: Cassini Delivers Most Detailed Saturn Image Ever CapturedPM NEWS: Saturn&amp;#039;s Moon Enceladus May Harbor Water \u2014Nick Mokey "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.popularmechanics.com/flight/a1837/4218927/>