Yes!

Yes. They are public domain once published. Don't copy the content and paste in your blog and definetly don't alter the content. I have done reviews or summaries of an article with a link to the source article for further reading. You have a right to review anything but you cannot alter the original content in any way with out copyright infringement.

I would think so, as long as you give them credit

Wow !! I didn't know this. Thank you. Great idea. :-)

Yes, you can. Make sure you cited the name of the source.

Thanks Darwyn...

Yes and see Darwyn has given you the link hope all goes well

Google love outbound links. Try Marion's Training here. Embed YouTube Video in WordPress Hope this helps.
Cheers
Darwyn

thank you all .

Yes. If the imbed code option appears at the bottom, it's OK to use. If it does not appear, then the author has blocked it. Otherwise you can only use the link to the video.

I embed you tube videos on my site all the time

On You Tube-hit the share button and see if you have an Embed Code. If you have a code you can use on your site. Use the Embed code in the "Text" mode.
John