A cockle is a type of shellfish. I don’t know how the association with the heart was formed, but it must be old—the Latin name for the order is “Cardiida”.

The “baby boom” (whence Boomers) was called that because it was a huge demographic spike that has given that birth cohort disproportionate political and cultural power ever since—and the generation most negatively impacted by that was the immediately-following Gen X. (Even now, after decades of an increasing mortality rate, Boomers still outnumber Gen X by about 8 million.)

CSI (and other shows that distort the public’s understanding of the criminal justice system—see the CSI effect).