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May. 27, 2021 , 11:34 AM For the first time, the U.S. National Academy of Sciences (NAS) has expelled a member who had been found guilty of sexual harassment. NAS’s governing council has rescinded the membership of astronomer Geoffrey Marcy, the academy told its members in an email yesterday. The action is the first since the 158-year-old NAS revised its bylaws 2 years ago to allow members to be expelled for documented misconduct violations. No actions were taken on the policy until fall 2020, when, after reading news accounts, a French scientist filed a complaint against Marcy and three other NAS members who had been investigated for sexual harassment. ....
By Fernando Gomollón-Bel2021-04-23T08:30:00+01:00 A new study has unveiled the molecular mechanisms that explain why porous materials can absorb violent shocks. The work also provides clues on how it might be possible to design new materials to withstand heavy impacts. Porous materials are widely known for their applications in gas adsorption and filtration. But, for decades, scientists have also been interested in their shock-absorbing potential. Researchers from Belgium and the UK were studying this shock-absorption behaviour in zeolitic imidazolate frameworks (ZIFs), a type of metal-organic frameworks with structural and topological properties that are characteristic of zeolites. ‘Originally, they were not created for shock absorption,’ explains Yueting Sun from the University of Birmingham, UK, co-first author of the paper. ‘However, this was a known application in zeolites and, given their similarities, the connection seemed pretty evident.’ ....