Physics Today Daily Edition
Geekwire: In Hillary Clinton's nomination acceptance speech at the Democratic National Convention, she stated that when it comes to climate change she accepts the scientific consensus. That puts her in direct contrast to Donald Trump, the Republican candidate, who has in the past called global warming a hoax and a money-making industry. Science is rarely mentioned in political campaigns—Trump didn't use the word at all in his own acceptance speech—so Clinton's "I believe in science" line resulted in a lot of plaudits from scientific commentators on social media. Clinton also shared her belief that shifting to clean energy will help bolster the US economy and drive technology and innovation.
So do physicists, who link a nanotechnology breakthrough to their late colleague Richard Feynman’s vision from a half century ago.
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.