EVER wonder why the bottom of a soda can is concave? Why a person won't be swung off the ''Octopus Machine''? How a television works? You will find all the answers at the 26th Joint School Science Exhibition.
The one-week exhibition features science projects with the theme ''Ever Wonder Why'' from 30 secondary schools which won the proposal competition held in March.
The overall championship went to Hoi Ping Chamber of Commerce Secondary School which submitted a project on soft drinks.
The school's display explores the carbon dioxide (CO2) effect of fizzy soft drinks and the shape and design of soft drink cans.
Yeung Hon-kuen, the project holder, said his team got the inspiration of using fizzy drinks as their theme after a football game.
''A group of sixth-formers were hot and thirsty after the game. Someone who had a soft drink gave a loud belch, and the others started making fun of him. Then we started wondering why soft drinks did that to us,'' said Hon-keun.
More than 20 Forms 4, 5 and 6 students from both the science and arts classes started researching the topic at the beginning of January.