Wow! Really interesting ..but we must not leave out the Environmental Impacts of these things..
I mean its mind blowing to know that 6 tons of Krathongs was removed from the said river...use of bio-degradable materials should totally replace other materials.
..by the way never knew you were once a dive instructor @gooddream
yeah, i still am an instructor but my license is many years out of date. I did that for about 4 years but there is no real future in that job... it's just playtime while you live a permanent vacation. It can actually be quite damaging to your future if you try to do it longer :P