A few months ago, after the last mass shooting, I saw the estimated intervals between mass shootings in the US in a Mother Jones article. I counted ahead from that date and made a note on my calendar that according to their estimates there would be another by December 4th... 

Mother Jone's article Inside The Race to Stop the Next Mass Shooter by Mark Follman

A few months ago, after the last mass shooting, I saw the estimated intervals between mass shootings in the US in a Mother Jones article. I counted ahead from that date and made a note on my calendar that according to their estimates there would be another by December 4th...