Penalty doubles are almost extinct

Andrew Mason, the founder and former CEO of Groupon, said, "All the trends show that email usage among the younger cohorts of internet users is declining. Whether it will take five or 30 years for email to go extinct, I'm not sure."

I find it hard to believe that email will become extinct. But in bridge, despite the evidence of this deal, it feels as if the penalty double has become extinct, except when the opponents are clearly sacrificing.

What is North's double in this auction? How can the defenders defeat three hearts doubled after West leads the club king?