[tag=PRP] [!□=□] □
[tag=PRP] [!lemma=□] □
[tag=PRP] [!tag=□] □
The invention of better , more precise instruments allowed us to develop new theories about our Earth and its inhabitants . We are reciprocally productive when others ’ theories motivate new observations and questions in our own realms and , conversely , when others ’ observations become incentives for us to develop new theories . We are developing new theories to predict the properties of such systems , including the subtle competition between gelation , crystallization and phase separation , structural reorganization in sticky particle suspensions , and the role of polymer rigidity , polymer-particle adhesive interactions and other chemically specific effects .