Clay weekly context brief for the Chemistry category (ISO week 2026-W29). Clay tracks publications from the Chemistry feed list. Below are recent items from this category, each with its source and a short description of what the publication covers when one is available in the source feed. Recent publications: 1. Policy Watch: FDA rejects petition to set PFAS limits in certain foods Source: Chemical & Engineering News Link: https://cen.acs.org/policy/fda-pfas-bottled-water-epa-chemical-particulate-matter-szabo/104/web/2026/07?sc=230901_cenrssfeed_eng_latestnewsrss_cen A weekly roundup of policy news in the chemical arena and beyond 2. Chemists get twice the reactivity from a single substitution handle Source: Chemical & Engineering News Link: https://cen.acs.org/synthesis/chemists-twice-reactivity-single-substitution/104/web/2026/07?sc=230901_cenrssfeed_eng_latestnewsrss_cen New reaction forms disubstituted products, thanks to a styrene radical cation intermediate 3. What the nose knows Source: Chemical & Engineering News Link: https://cen.acs.org/environment/atmospheric-chemistry/urban-smellscape-dog-breath-spray/104/web/2026/07?sc=230901_cenrssfeed_eng_latestnewsrss_cen Olfactory city tours and a chemical solution for curing dog breath 4. Meet the 2026 CAS Future Leaders Source: Chemical & Engineering News Link: https://cen.acs.org/acs-news/meet-2026-cas-future-leaders/104/web/2026/07?sc=230901_cenrssfeed_eng_latestnewsrss_cen 31 early-career scientists head to CAS headquarters to level up their careers 5. C&EN weekly chemistry news quiz, July 10 Source: Chemical & Engineering News Link: https://cen.acs.org/pharmaceuticals/vaccines/cen-weekly-chemistry-news-quiz-july-10/104/web/2026/07?sc=230901_cenrssfeed_eng_latestnewsrss_cen Test your knowledge of our stories on rotaxanes, EPA regulations, flexible batteries, and more 6. HIV vaccine candidates reach milestone in primates Source: Chemical & Engineering News Link: https://cen.acs.org/pharmaceuticals/vaccines/hiv-vaccine-candidates-reach-milestone/104/web/2026/07?sc=230901_cenrssfeed_eng_latestnewsrss_cen Multistep vaccination strategy coaches B cells to raise broadly neutralizing antibodies 7. China bets on AI to speed up science despite chip limits Source: Chemical & Engineering News Link: https://cen.acs.org/policy/china-research-labs-ai-artificial-intelligence-llm-agentic-supercomputer-microchip/104/web/2026/07?sc=230901_cenrssfeed_eng_latestnewsrss_cen Driven by aggressive state policies and a national supercomputing network, Chinese labs are rapidly embedding AI into daily research 8. ACS Egypt to host Third International Conference on Chemical Sciences Source: Chemical & Engineering News Link: https://cen.acs.org/acs-news/acs-egypt-third-international-conference-chemical-sciences/104/web/2026/07?sc=230901_cenrssfeed_eng_latestnewsrss_cen The event will take place July 1920 with the theme Small Molecules from Discovery to Sustainable Applications 9. 80-year-old US Navy asbestos study faces call for retraction Source: Chemical & Engineering News Link: https://cen.acs.org/policy/publishing/navy-study-asbestos-retraction/104/web/2026/07?sc=230901_cenrssfeed_eng_latestnewsrss_cen The controversial study was presented as evidence before the US Supreme Court as recently as 2018 10. A simpler way to make rotaxanes Source: Chemical & Engineering News Link: https://cen.acs.org/synthesis/rotaxane-synthesis-molecular-machine/104/web/2026/07?sc=230901_cenrssfeed_eng_latestnewsrss_cen No need for metals or recognition sites to build these molecular machines 11. Using AI songs to learn physical chemistry Source: Chemical & Engineering News Link: https://cen.acs.org/physical-chemistry/ai-thermodynamics-music-education-physical-chemistry/104/web/2026/07?sc=230901_cenrssfeed_eng_latestnewsrss_cen Musical format aims to make concepts and equations easier to grasp and remember 12. EPA moves to cut risks from PFAS in fertilizer, pans Biden-era analysis Source: Chemical & Engineering News Link: https://cen.acs.org/policy/chemical-regulation/epa-pfas-risk-biosolid-sewage-sludge-fertilizer/104/web/2026/07?sc=230901_cenrssfeed_eng_latestnewsrss_cen Critics say the agencys draft guidance minimizes the risks from PFOA and PFOS in biosolids used as fertilizer and places too great a burden on the public 13. Business Watch: Anthropic launches Claude Science; AstraZeneca links with CSPC again Source: Chemical & Engineering News Link: https://cen.acs.org/business/business-watch-anthropic-claude-science-astrazeneca-cspc/104/web/2026/07?sc=230901_cenrssfeed_eng_latestnewsrss_cen Heres what were watching in the chemical and pharmaceutical industries this week 14. This new stretchable battery harvests water from air Source: Chemical & Engineering News Link: https://cen.acs.org/materials/energy-storage/battery-water-harvest-electrolyte/104/web/2026/07?sc=230901_cenrssfeed_eng_latestnewsrss_cen The device, which pulls moisture from the atmosphere to form its electrolyte, could power wearable health monitors 15. Dont forget about electricity when greening your chemistry lab Source: Chemical & Engineering News Link: https://cen.acs.org/environment/green-chemistry/dont-forget-electricity-greening-chemistry/104/web/2026/07?sc=230901_cenrssfeed_eng_latestnewsrss_cen This Greening Chemistry column highlights an easy-to-overlook but important factor that affects both a laboratorys energy use and expenses 16. Solstice to buy Element Solutions for $14.5 billion Source: Chemical & Engineering News Link: https://cen.acs.org/materials/electronic-materials/solstice-buy-element-solutions-145/104/web/2026/07?sc=230901_cenrssfeed_eng_latestnewsrss_cen Honeywell spin-off invests further into electronic materials 17. C&EN's Global Top 50 chemical firms for 2026 Source: Chemical & Engineering News Link: https://cen.acs.org/business/finance/CENs-Global-Top-50-2026/104/web/2026/07?sc=230901_cenrssfeed_eng_latestnewsrss_cen The long chemical downturn continues to imperil the worlds top companies Sources in this brief: Chemical & Engineering News. Selected 17 of 30 available items for this weekly brief.