In the case of journal articles/scientific papers, you may find that full access requires payment in the absence of an institution membership to that particular journal.
A search for the authors listed may be useful, with many having institution pages or personal websites with full access to the original manuscripts of their research available in PDF format.
Webcasts of powerpoint presentations is becoming increasingly popular, so please search on YouTube using good keywords.
In the UK, both the BBC and The Guardian offer excellent coverage of science and technology.
Please also see Links section.