Physics Today Daily Edition
IEEE Spectrum: Moore's law describes a historical trend concerning the density of transistors on computer chips, which has been doubling roughly every two years since the 1970s. The primary driver has been the continuing reduction in transistor size. However, a new analysis of transistor technologies suggests that by 2021 manufacturers will no longer find it economically viable to decrease the dimensions of transistors any further. The analysis, included in the 2015 International Technology Roadmap for Semiconductors, suggests that manufacturers will probably continue to be able to increase transistor density by layering transistors vertically.
BBC: The Amazon basin is one of the world's largest carbon reservoirs, with the plants there holding roughly 17% of Earth's vegetation-stored carbon. A new study has revealed, however, that two recent droughts have adversely affected the basin's ability to absorb carbon. According to coauthor Ted Feldpausch of the University of Exeter, UK, during one of the droughts, in 2010, the rate of vegetation mortality increased and the growth rate slowed, which resulted in the region releasing more carbon than it was taking in. In nondrought years, the region absorbs hundreds of millions more tons of carbon than it loses.
Science: China's space program has set an ambitious schedule as it tries to be seen as an equal partner to NASA and the European Space Agency (ESA). The schedule includes launching more than four missions over the next 13 months. Moreover, the country's lunar exploration program hopes to launch a sample return mission next year, and its first-ever landing on the far side of the moon is planned for 2018. Beginning in 2020 China will launch four science missions and the nation's first Mars probe. Unlike NASA or ESA, the Chinese space program doesn't receive annual funding but instead gets one lump sum every five years. That arrangement doesn't adjust for inflation or allow for last-minute plan changes. In addition, the country's different space agencies are competing for scarce resources and missions. The solution, say Chinese space administrators is to merge agencies into one.