public marks

PUBLIC MARKS with tags science & diy

2008

2007

2006

Sundials on the Internet - Five sundial projects for you to make

by phgod
利用簡單的工具，便可自製日昝進行時間測量，十分有趣。

2005

Science Toys

by wyliej & 12 others
Science Toys You Can Make With Your Kids

2004

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