Behind almost every major medical breakthrough are people willing to challenge old assumptions, fund difficult research and spend years searching for answers others thought might never come.
I have always been fascinated by people who dedicate their lives to solving problems that seem almost impossible.
Medicine is full of them.
Scientists, physicians, philanthropists and researchers have transformed diseases that were once poorly understood into conditions that can be detected earlier, managed better or, in some cases, prevented entirely.
Today, one of the biggest remaining challenges is the human brain. And Alzheimer's disease sits at the center of that challenge.
Many of medicine's biggest advances began with researchers questioning an explanation everyone else had accepted.
By investigating biology from a different angle, generations of scientists have uncovered mechanisms that eventually changed how diseases were diagnosed and treated.
Explore the research →After building one of the world's most influential technology companies, Bill Gates devoted much of his attention to philanthropy and global health.
His work has supported research involving infectious disease, diagnostics, vaccines and other technologies designed to help scientists tackle complex health problems.
Alzheimer's eventually became a particularly personal area of interest after his own family experienced the disease.
Read more →Alzheimer's researchers face an unusual problem: changes associated with the disease can begin long before obvious cognitive symptoms appear.
Scientists are therefore developing new ways to investigate the disease earlier, including blood-based biomarkers, advanced imaging, genetics and large-scale data analysis.
Discover what's changing →The story of Alzheimer's isn't only about laboratories.
Families and caregivers live with the consequences of cognitive decline every day. Their experiences have helped drive awareness, research funding and demand for better answers.
They are also among the biggest reasons scientists continue pushing the field forward.
See the latest research →Gates' interest in Alzheimer's became personal after his father, William H. Gates Sr., developed the disease.
He has publicly discussed how difficult it is for families to watch someone they love experience progressive cognitive decline.
Gates later committed personal funding to Alzheimer's and dementia research, supporting efforts to improve our understanding of the disease and accelerate the development of better diagnostic and research tools.
Alzheimer's remains one of medicine's most complicated challenges. There is currently no established cure.
But researchers now have tools that previous generations of scientists could only imagine.
Artificial intelligence can analyze enormous datasets. New blood tests are being developed to identify biological markers associated with Alzheimer's. Genetics can help researchers understand why certain people may face greater risk.
Scientists are also investigating the relationship between the brain and other biological systems, including vascular health, metabolism and inflammation.
The heroes of the next medical breakthrough may already be working on a question most people haven't thought to ask yet.
Science • Research • DiscoveryScientific progress rarely follows a straight line.
Researchers develop theories, test them, discover limitations and then use what they've learned to ask better questions.
That's especially important in Alzheimer's research, where scientists are increasingly examining multiple biological pathways rather than assuming a single process explains every aspect of cognitive decline.
As researchers explore Alzheimer's from different directions, new questions are emerging about the biological processes associated with cognitive decline and what they could mean for the future of Alzheimer's research.
Watch this presentation exploring cognitive decline, Alzheimer's disease and a biological mechanism being examined from a different perspective.