Bill Gates at Gates Notes:
The two technologies often get lumped together, which is understandable given how similar they seem on the surface. But the reality is that, in many ways, fission and fusion are opposites. Knowing how each one works—and why they are different—is critical to understanding the roles they will play in the decades ahead.
When people talk about “nuclear power,” they are almost always talking about fission. Fission has been powering homes around the world since 1954 (the year before I was born!). Although the technology has evolved a lot over the years—and continues to improve, as I’ll explain—the fundamental physics remains the same.
More here.
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