In science news around the world this week, space researchers in Switzerland are seeking funding to build a spacecraft that would help reduce space debris in orbit around Earth, the Gates Foundation is funding agricultural impact monitoring in Africa, and journals have been warned not to publish diesel exhaust studies.

This week, InnoCentive announced the winners of its latest Web-based challenge: to use smartphones to detect potholes. And a graph posted by the National Institutes of Health this month highlights the growing imbalance between the youngest and oldest researchers.