Physics Today Daily Edition
New York Times: On 1 July, NASA announced mission extensions for nine current spacecraft that have already completed their primary missions. The New Horizons probe, which flew past Pluto, will continue on to study the Kuiper belt object 2014 MU69. The other funded missions are Dawn, which is orbiting Ceres; the Lunar Reconnaissance Orbiter; the Mars Reconnaissance Orbiter; the Mars Atmosphere and Volatile Evolution orbiter; the Opportunity and Curiosity rovers on Mars; the Mars Odyssey orbiter; and the European Space Agency's Mars Express, for which NASA is providing support. Extensions for most of the missions were expected, but the inclusion of Dawn surprised the team that is managing the mission. The craft is low on fuel because of its reliance on thrusters after the failure of two reaction wheels. Now Dawn will remain in place around Ceres, where it will continue to make observations as the dwarf planet approaches perihelion.
IEEE Spectrum: Many facial recognition algorithms have a success rate above 95% when tested against databases of just a few thousand faces. A new test called the MegaFace Challenge evaluates the performance of algorithms when they are presented with a database of 1 million images of 690 000 people. The challenge is for the algorithms to evaluate whether two different pictures are of the same person and to determine if a given person is in the database. The success rates for all the tested facial recognition programs dropped significantly when faced with so much data. Google's FaceNet, the top-scoring algorithm tested, dropped from near 100% accuracy on the widely used Labeled Faces in the Wild (LFW) test to just 75% on the MegaFace Challenge. Several algorithms that scored above 90% on LFW dropped to below 60% accuracy. Ira Kemelmacher-Shlizerman of the University of Washington in Seattle and his colleagues organized the MegaFace Challenge to evaluate the effectiveness of facial recognition software in more realistic situations.