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Responsive web design video questions

1.) What are the advantages of having reset.css or normalize... against of coding without it? Which one (reset.css or normalize) is better?

2.)As I know the conditional statements <![if lt IE 8]> are deprecated since IE10.
Please update the video.

3.)I've listened to a webinar from Jonathan Stark on Responsive ... and he said he changed all px to em in media queries. Can You comment that? Is that a must do? What are pros and cons of using em instead of px|pt - for fonts, media queries, widths and heights?
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