[PPT reading] Waves

A easy understanding of basic sound wave introduction
http://www.cyut.edu.tw/~cpyu/wavesa.ppt

[Book reading] 從科學貫通哲學 作者：畢家湘

A very good book especially chapter 2. Introduce "methodology for study in scientific way"..

洪蘭VS.曾志朗：如何活出生命力？

Very good video for kid development..