Bill Gates is navigating a turbulent period blending ambitious philanthropy with renewed scrutiny over his past ties to Jeffrey Epstein, as the Microsoft co-founder and billionaire philanthropist testifies before Congress next month while his foundation ramps up spending to counter what he calls a dangerous reversal in global progress.

In recent months, Gates has sounded alarms in his annual letter and public appearances, warning that cuts to foreign aid and global health funding risk pushing the world toward a new "Dark Ages" within five years if innovation and investment falter. Yet he maintains guarded optimism, arguing that breakthroughs in AI, clean energy and health tools could deliver unprecedented advances by 2045 if the next decade stays on track.