Other finalists for the fair included Pranav Sivakumar, 15, from Aurora, Illinois, who devised an automated method for discovering and analyzing gravitationally-lensed quasars; 14-year-old Krtin Nithiyanandam from Surrey, England, who designed a test for detecting Alzheimer's in its early stages (there was also another test by Anika Cheerala, 13 USA) ; Lalita Prasida Sripada Srisai, 13, from India, who found a way to make waste water clean by filtering it through corn cobs; and a French 14-year-old, Eliott Sarrey, who built a robot capable of tending to gardens.
For Sri Lanka, Lalita Srisai's project of cleaning waste water using Corn Cobs is probably very useful. Very, very cool. Plenty of corn cob (බඩ ඉරිඟු) in SL.
Adriel Sumathipla, 16 USA (sounds like he is of Sri Lankan descent) was a global finalist with his Multi-Biomarker Diagnostic for Cardiac Disease:Rapid. Portable. Ultra-Low Cost.
Note: South Asians seem over represented among finalists and specially the winners.