ื ืื ืงืคึผื ืืึทืกืข ืืึทืืึทื ืกืขืจ ืคืื MIT
ืื ืฉืขื ืึทื ืืึธ ืกืืกืืขื ืืื ืคึผืืึทื ื ืขื ืฆื ืืืื ืืขืืืืื ื ืืื ืืึทืื ืกืขื ืืขืจืก. / ืคืึธืืึธ Marco Verch CC BY ืืืื ืืืื ืฉืคึผืืึทืืขืจ, ืืึทืื ืกืขื ืืขืจืก ื ืืฆื ืืืืื 20-40% ืคืื ืื ืื ืืืฆื ืงืึทืืคึผืืืืื ื ืืึทืื. ืืื ืืืื ืืึธืืื ืืขื ืฆืืคืขืจ ืงืขื ืขื ืืขืจืืจืืืื 60%. ืื ืคืึทืจืฉืคึผืจืืืืื ื ืคืื ืจืขืกืืจืกื ืคืืจื ืฆื ืื ืืืขืจืืืฉืึทื ืก ืคืื ืึทืืื ืืขืจืืคืขื ืข "ืืึทืืื ืกืขืจืืืขืจืก". ืืืก ืืขื ืขื ืืืฉืื ืขื ืืืืก ืืืฆื ืืืืืืง ืจืื ืคืื ืื ืฆืืื, ืืื ืคืืจืืืืจืคื ืขื ืขืจืืืข. ืืืึทื ื 30% ืคืื ืกืขืจืืืขืจืก ืืื [โฆ]