Ask HN: What's the most interesting thing in technology in 2015?

My top two are: Carbon3D printer and Microsoft Hololens

I would also say www.campusbulletinboard.com; let me know what you think?

3d printing and VR.

VR and machine learning

Price drop on 3d printing.

I think Fintech is interesting from a P2P perspective. When regulation gets involved it gets hard so starting a sharing platform and moving it towards a bank seems a more likely.