This issue features articles by The Grainger Foundation US Frontiers of Engineering 2024 symposium participants. The articles examine cutting-edge developments in microbiology and health, artificial intelligence, the gut-brain connection, and digital twins.

• Guest Editor's Note: The Grainger Foundation Frontiers of Engineering 2024 Symposium
• Achieving Impact through Human Behaviors and Community Engagement in Human Health Risk Assessment
• Designing Waste Management Systems to Prevent the Spread of Antibiotic Resistance: Challenges and Opportunities

The summer issue of The Bridge discusses leveraging new and emerging technologies, infrastructure, innovative approaches, and a resilient supply chain to ensure a stable and reliable supply of critical materials far into the future.

• President's Perspective: The Power of Member Engagement
• Editor in Chief's Note
• Guest Editor's Note: The Future of Critical Materials

This issue features articles by 2023 US Frontiers of Engineering symposium participants. The articles cover pressing global issues including resilience and security in the information ecosystem, engineered quantum systems, complex systems in the context of health care, and mining and mineral resource production.

• President's Perspective: The Diversification of the National Academy of Engineering
• Guest Editor's Note: The Grainger Foundation Frontiers of Engineering 2023 Symposium
• From Accidental Rumors to Pervasive Disinformation A Decade of Misinformation Research