Twitter may be considered to be a decentralized social information processing platform whose users constantly receive their followees’ information feeds, which they may in turn dispatch to their followers. This decentralization is not devoid of hierarchy and heterogeneity, both in terms of activity and attention. In particular, we appraise the distribution of attention at the collective and individual level, which exhibits the existence of attentional constraints and focus effects. We observe that most users usually concentrate their attention on a limited core of peers and topics, and discuss the relationship between interactional and informational attention processes—all of which, we suggest, may be useful to refine influence models by enabling the consideration of differential attention likelihood depending on users, their activity levels, and peers’ positions.

 

Interactional and Informational Attention on Twitter
Agathe Baltzer, Márton Karsai, and Camille Roth
Information 2019, 10(8), 250

Source: www.mdpi.com

Earth’s climate is changing, and we must decide what to do about it. Existing climate models all predict further warming, but for all we currently know, this trend could range from modest and manageable to an existential threat. In face of such large uncertainty it is difficult to agree on a course of action. For this reason, we propose the formation of an international initiative for high resolution climate models with the aim of providing more reliable long-term predictions.

Source: blogs.scientificamerican.com

•Using international data on universities we study their impact on regional growth.

•Increases in universities are positively and robustly associated with higher growth.

•This effect spills over into neighbouring regions within the same country.

•Increasing regional human capital and innovation matter help mediate this effect.

•The economic benefits of university expansion are likely to exceed the costs.

 

The economic impact of universities: Evidence from across the globe

Anna Valero, John Van Reenen

Economics of Education Review
Volume 68, February 2019, Pages 53-67

Source: www.sciencedirect.com

• There are still major cybersecurity vulnerabilities facing the 2020 U.S. presidential election, in part because the election system is based on faith instead of evidence.
• Foreign attackers could target voter-registration rolls and election machinery to either influence the outcome or sow chaos and doubt.
• The worst-case scenarios could result in an unprecedented constitutional crisis.

Source: www.scientificamerican.com

•Spatial clustering is applied to coordinates of the building stock in Germany.

•We determine the percolation distance at which a country spanning cluster emerges.

•The top five largest holes in that mesh are or were military training areas.

•The building density decreases with the clustering threshold following a power-law with an exponent close to 0.75.

•The overbuilding is a phenomenon that is beyond the dichotomy of sprawled and compact urban development.

 

Settlement percolation: A study of building connectivity and poles of inaccessibility

Martin Behnisch, Martin Schorcht, Steffen Kriewald, DiegoRybski

Landscape and Urban Planning
Volume 191, November 2019, 103631

Source: www.sciencedirect.com