Back when I was knee-deep in thesis research, I had the same question about 'Nature'—it felt like the holy grail of journals, but paywalls were everywhere. After some digging, I found that while the full PDFs usually require institutional access or individual payment, there are workarounds. Some articles are marked as open access, especially those funded by public grants. Authors often share preprints on platforms like arXiv or ResearchGate, too.
If you're affiliated with a university, check your library's subscriptions—they might have access. For independent researchers, Google Scholar sometimes links to free versions, though it’s hit or miss. I’ve also stumbled upon Twitter threads where scientists share their papers upon request. It’s not a perfect system, but the academic community can be surprisingly generous if you reach out.