Materials Identification Based on Passively Emitted Electromagnetic Radiation

I just encountered a new data mining competition featuring a $45,000 prize for materials identification. Here is the link: Materials Identification Based on Measurements of Passively Emitted Electromagnetic Radiation

I find this challenge very similar to the explosive detection project I am working on. We are detecting explosives (TNT etc.) from their hyperspectral signatures using differential spectrometry. More on it later.

Online product recommendations challenge

Overstock.com has a $1 million prize challenge for retail personalization. Who doesn't want to easily find relevant products from the millions available online? Here is the link