SETI

I heard and used the SETI program 4 years ago. SETI stands for Search for Extraterrestrial Intelligence. It is a scientific effort seeking to determine if there is intelligent life outside Earth. Everyone having internet connection can participate in this effort by downloading a software that listens and analysis artificial radio signals coming from other stars. You can download the software from here.
And who knows, maybe your computer will detect Extraterrestrial Intelligence!!
More information about SETI, click here.