research associates before the first 300kg (661lbs) rings went into the water at a test site in 2014. Local people also helped select the best sites for the concrete rings to be placed two years later when they were moved to their final destination in 2016. "I always respect indigenous knowledge," says Chowdhury.

อ่านต่อได้ที่ : โรงเรียนบ้านควรพรุพี

สาระน่ารู้ : ซึมเศร้า