Ran SETI for years on my pc's until they quit, never found any ET either. One can still use their pc power to look for quasi-stellar objects, pulsars, other astrophysics projects. I've been using my pc's now to run climate studies for Oxford University, molecular simulations of proteins for Barcelona Biomedical Research, and environmental research for BOINC Poland Foundation. My kids and grandkids run different projects also (Was my requirement for building their rigs).
Anybody can help out science with their pc's, give it go.
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