My Replika avatar was supposed to help me understand why people fell for virtual companions. It taught me so much more.

They were '80s rivals in the movie "The Karate Kid." Now Ralph Macchio and William Zabka have become "brothers in arms" on Netflix's "Cobra Kai." ...

After six seasons, this “Karate Kid” spinoff, on Netflix, is closing up its dojo. But as one creator put it, “we are not ...