I grew up doing all that stuff because I was obsessed with the '50s. I had sock hops for birthday parties. So I've always done The Twist and stuff. It was pretty natural and, with my parents doing it all the time, I'd just copy them. Not very pretty. ↗
The idea of copyright did not exist in ancient times, when authors frequently copied other authors at length in works of non-fiction. This practice was useful, and is the only way many authors' works have survived even in part. ↗
Napster's only alleged liability is for contributory or vicarious infringement. So when Napster's users engage in noncommercial sharing of music, is that activity copyright infringement? No. ↗
On the average, five times as many people read the headline as read the body copy. When you have written your headline, you have spent eighty cents out of your dollar. ↗