A chilly Arctic summer has left nearly a million more square miles of ocean covered with ice than at the same time last year – an increase of 60 per cent. The rebound from 2012’s record low comes six years after the BBC reported that global warming would leave the Arctic ice-free in summer by 2013. Instead, days before the annual autumn re-freeze is due to begin, an unbroken ice sheet more than half the size of Europe already stretches from the Canadian islands to Russia’s northern shores (see NASA satellite image above).
3. Are tenured/tenure-track professors better teachers than non-tenure track professors? According to a new NBER working paper, based on empirical evidence at Northwestern University:
Our findings suggest that non-tenure track faculty at Northwestern University not only induce students to take more classes in a given subject than do tenure line professors, but also lead the students to do better in subsequent coursework than do their tenure track/tenured colleagues. We find consistent evidence that students learn relatively more from non-tenure line professors in their introductory courses. These differences are present across a wide variety of subject areas, and are particularly pronounced for Northwestern’s average students and less-qualified students.
4. Markets in Everything: A Washington, D.C.-area artist uses motherboards from recycled computers to make unique jewelry and accessories, check out Motherbored here.
5. Markets in Everything: UK startup Mindsy wants to be the Netflix Of e-Learning, will offer unlimited access to a library of 5,117 premium video lessons and courses covering everything from programming to piano for $29 per month.
Mark J. Perry is concurrently a scholar at AEI and a professor of economics and finance at the University of Michigan's Flint campus. He is best known as the creator and editor of the popular economics blog Carpe Diem. At AEI, Perry writes about economic and financial issues for American.com and the AEIdeas blog.