Fig. 2
From: Quantifying the diaspora of knowledge in the last century
Most attractive topics in the knowledge diaspora. The flow network of each temporal snapshot of 5 years is compared with the one immediately subsequent, and the relative changes in the volume of authors attracted by a topic (see Eq. (2)) are computed. For each temporal snapshot, we report the largest relative change observed in the volume. Color codes the area (reported on the right-side of the plot) each topic belongs to. The relative increase is encoded in the radius of circles