If you are seeking the latest knowledge, follow lectures at the best universities in the world:

https://podcasts.ox.ac.uk/

https://www.cam.ac.uk/video-and-audio

http://academicearth.org/universities/harvard/

http://oyc.yale.edu/

 

For  improving your communicative competence in English:

https://www.youtube.com/user/bbclearningenglish

http://learnenglish.britishcouncil.org/en/

http://www.bbc.co.uk/learningenglish

http://dictionary.cambridge.org/

http://www.middleschoolchemistry.com/

http://www.bbc.co.uk/science

http://www.livescience.com/

 

For  improving your reading skills:

http://www.telegraph.co.uk/

http://www.independent.co.uk/

http://www.theguardian.com/uk

http://www.thetimes.co.uk/tto/news/

http://www.rollingstone.com/

http://www.thesundaytimes.co.uk/sto/

http://spectator.sme.sk/

 

For improving your listening skills:

https://www.youtube.com/user/TEDtalksDirector

http://www.youtube.com/results?search_query=bbc+news

https://www.youtube.com/user/NationalGeographic

https://www.nasa.gov/audience/forstudents/index.html

http://www.esa.int/Education