The best way to feed the hungry is to implement systemic change which improves education, distributes productivity more evenly, invests in primary research across a broad range of domains, eliminates debt slavery, and - most of all for this three - keeps qualified physicists in research and out of fintech.

You need to throw politics at poverty and homelessness, not just cash.

Not incidentally, lowering the barriers to physics education and changing the incentives towards risky imagination and away from calculated academic careerism would also make breakthroughs in physics more likely.