Let me introduce you to the following feed (RSS)
InnoCentive Challenges Category; Physical Sciences
You will find particularly motivating current problems to solve with much back-ground information on real-life science based theoretical, technological and engineering problems to solve, many of which are cryingly urgent for many of the worlds populations.
Delays are short so check the link regularly, bookmark them and do not hesitate to contact me for any further assistance, co-operation, caring and sharing.
I have also included a rapid and permanently placed access link in my site-blog listings centred under the header blocks