  Teamwork is one of the most prominent features in modern science. It is now
well-understood that the team size is an important factor that affects team
creativity. However, the crucial question of how the character of research
studies is influenced by the freshness of the team remains unclear. In this
paper, we quantify the team freshness according to the absent of prior
collaboration among team members. Our results suggest that fresher teams tend
to produce works of higher originality and more multi-disciplinary impact.
These effects are even magnified in larger teams. Furthermore, we find that
freshness defined by new team members in a paper is a more effective indicator
of research originality and multi-disciplinarity compared to freshness defined
by new collaboration relations among team members. Finally, we show that career
freshness of members also plays an important role in increasing the originality
and multi-disciplinarity of produced papers.
