Motivational speaker and author Tony Robbins has a catalog of quotes that help his readers and followers easily recall his advice tips.

The 1970s was a dynamic decade, marked by iconic celebrities whose voice significantly helped to shape culture and instigated ...

A: This is indeed a challenge. The situation is easiest when species are lumped. In that case, for each count circle and year, we sum the counts of all the lumped species. The situation is trickier ...