South African girl wins International Science Expo
Chené Mostert from Hoërskool Ladysmith in KwaZulu-Natal invented a sterilization appliance for toothbrushes after she tested 150 different toothbrushes and found more than 100 different types of bacteria that grew on them.
The invention consists of hydrogen peroxide in a plastic container with 4 tubes to house the toothbrushes and a rotating system that scrubs the toothbrush when turning the handle manually. The container then also closes with a lid to prevent any further contamination with bacteria. Hydrogen peroxide is the safest sterilization chemical and does not leave a bad taste in the mouth.
Original article: www.beeld.com
Image source: www.beeld.co.za