What font is this?

I've seen this beautiful font many times in the public, and I've searched a lot of sites but couldn't find out what the font in the headings of the following pictures are.

Sutd-talk_-21-oct-2010_medium

via educator.sp.edu.sg

Sutd-technology-and-design-challenge_medium

via www.qompete.com

If you recognise the font please let me know what you think it is. Thanks.