With that motivation, he decided he wanted to be an environmental engineer, and found himself in the agricultural and biological engineering program at Penn State University, where he focused on soils and water research.
Update april 2016: The top 3 best sold battery powered weed eaters are the: 1) Black & Decker LST136W. 2) GreenWorks 21332 G-MAX. 3) Worx WG175 MAX. As you can see 2 out of 3 are still going strong since 2014, namely the Black & Decker LST136W and the Worx WG175 MAX, see their reviews below.
Has an anti-vibration system, is CARB compliant, and has semi-auto spool feeding, which owners find to be a very valuable feature. Feels robust for a battery-powered weed eater and is well-balanced, despite the weight of the battery in the end of the handle. The lightest of our selection at just 9.9 lbs. The trigger handle is cushioned to reduce vibration, and there's a useful additional control handle on the main shaft.