Answer the following question: What type of details about ray wijewardene  can be gathered from the following bio?  Bio: deshamanya vidya jyothi dr philip revatha `` ray '' wijewardene -lrb- sinhala : ප ල ප ර වත ව ජයවර ධන -rrb- -lrb- 20 august 1924 -- 18 august 2010 -rrb- was a sri lankan engineer , aviator , inventor and olympian athlete . he was an authority on tropical farming and natural resource management , on which topics he originated systemic thinking . he also invented a number of devices to assist small farmers in developing countries .
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