The Bill & Melinda Gates foundation is inviting grant proposals for the following Grand Challenges and Grand Challenges Explorations initiatives.
https://gcgh.grandchallenges.org/
The Grand Challenges family of initiatives fosters innovation to solve key global health and development problems.
The application deadline is April 22, 2020.

Accelerating Discovery for Non-Hormonal Contraceptives: Grand Challenges seeks new approaches and concepts for the characterization of contraceptive drug targets, the identification of active contraceptive compounds, and the development of novel and impactful research tools with the potential to revolutionize the field of contraceptive R&D.

Improving Access to and Use of Safe and Appropriate Cesarean Section: Grand Challenges seeks ideas for interventions to address challenges related to cesarean section: increasing access to cesarean section where it is currently inadequate, increasing quality and safety of cesarean section to reduce iatrogenic harm to both mothers and newborns, and reducing rates of non-medically indicated cesarean section.

Innovations in Materials Science for a Transformative Menstrual Health and Hygiene Product: Grand Challenges Explorations seeks transformative and innovative ideas to support the design and development of a new menstrual health and hygiene product that meets key criteria of being responsive to user needs, focusing on discreetness, affordability, and sustainability.

Innovations for Improving the Impact of Health Campaigns: Grand Challenges Explorations seeks innovative solutions that accelerate the improvement of coverage, reach, efficiency, and effectiveness of campaign-based delivery of health interventions.