Abstract
Superunification underwent a major paradigm shift in 1984 when eleven-dimensional supergravity was knocked off its pedastal by ten-dimensional superstrings. This last year has witnessed a new shift of equal proportions: perturbative ten-dimensional superstrings have in their turn been superseded by a new non-perturbative theory called M-theory, which describes supermembranes and superfivebranes, which subsumes all five consistent string theories and whose low energy limit is, ironically, eleven-dimensional supergravity. In particular, six-dimensional string/string duality follows from membrane/fivebrane duality by compactifying M-theory on S 1/Z 2×K3 (heterotic/heterotic duality) or S 1×K3 (Type IIA/heterotic duality) or S 1/Z 2×T 4 (heterotic/Type IIA duality) or S 1×T 4 (Type IIA/Type IIA duality).
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