Bones from an eagle talon with parallel cut marks

Symbolic behavior in Neanderthals

Nov. 22, 2019

A new discovery provides rare evidence of symbolic behavior in Neanderthal communities and extends the record further geographically and temporally across Europe. Rodríguez-Hidalgo et al. analyzed recently unearthed Spanish imperial eagle phalanges, which were found along the Iberian Peninsula, and inferred that Neanderthal communities used these talons for symbolic purposes...

Times between interstate war onsets, 1823– 2003.

On the frequency and severity of interstate wars

Oct. 23, 2019

Lewis Fry Richardson argued that the frequency and severity of deadly conflicts of all kinds, from homicides to interstate wars and everything in between, followed universal statistical patterns: their frequency followed a simple Poisson arrival process and their severity followed a simple power-law distribution. Although his methods and data in...

Mean degree ⟨k⟩ as a function of the number of nodes n. The 928 network data sets in the corpus studied here vary broadly size and density.

Scale-free networks are rare

Oct. 23, 2019

Real-world networks are often claimed to be scale free, meaning that the fraction of nodes with degree k follows a power law k − α , a pattern with broad implications for the structure and dynamics of complex systems. However, the universality of scale-free networks remains controversial. Here, we organize...

On synthetic networks, the mean link prediction performance (AUC) of selected individual predictors and all stacked algorithms across three forms of structural variability

Stacking Models for Nearly Optimal Link Prediction in Complex Networks

Oct. 23, 2019

Most real-world networks are incompletely observed. Algorithms that can accurately predict which links are missing can dramatically speedup the collection of network data and improve the validity of network models. Many algorithms now exist for predicting missing links, given a partially observed network, but it has remained unknown whether a...

Inside Hire Ed

Pedigree and Productivity

May 2, 2019

A 2015 study found that “social inequality” across a range of disciplines was so bad that just 25 percent of Ph.D. institutions produced 71 to 86 percent of tenured and tenure-track professors, depending on field. The effect was more extreme the farther up the chain the researchers looked, based on...

Graphs for article "Pedigree is Not Destiny"

'Pedigree is not destiny' when it comes to scholarly success

May 1, 2019

What matters more to a scientist’s career success: where they currently work, or where they got their Ph.D.? It’s a question a team of researchers teases apart in a new paper published in PNAS . Their analysis calls into question a common assumption underlying academia: that a researcher’s productivity reflects...


Do all networks obey the scale-free law? Maybe not

March 4, 2019

As Benjamin Franklin once joked, death and taxes are universal. Scale-free networks may not be, at least according to a new study from CU Boulder. The research challenges a popular two-decade-old theory that networks of all kinds, from Facebook and Twitter to the interactions of genes in yeast cells, follow...

Two Lab Members Discuss Work

Academic ideas are supposed to thrive on their merits. If only.

Oct. 24, 2018

Allison C. Morgan, Dimitrios J. Economou, Samuel F. Way and Aaron Clauset are all scholars in the department of computer science at the University of Colorado at Boulder. They have just published an important new article about how ideas spread within the academy. I asked them a series of questions...

Paid parental leave sorted by name of organization

BioFrontiers research cited in article related to updated UVa paid parental leave policy

Sept. 12, 2018

Adapted from The Daily Progress article . The University of Virginia on Tuesday announced expanded paid leave benefits for new parents — a move that goes beyond a state executive order and one that could help the school remain competitive with its peers. In June, Gov. Ralph Northam issued an...


Nothing unusual about 'the long peace' since WWII

Feb. 26, 2018

Since the end of World War II, few violent conflicts have erupted between major powers. Scholars have come to call this 73-year period “the long peace.” But is this stretch of relative calm truly unusual in modern human history – and evidence that peace-keeping efforts are working? Or is it...