Physicists will discover the ultimate "Theory of Everything" unifying quantum theory and general relativity by the end of 2100.

Pending ●●●●●

“Nevertheless I am confident we will discover it by the end of the 21st century and probably much sooner.”

Said on: 6 March 1998 · White House Millennium Evening lecture. In the next sentence he offered only 50-50 odds that it would come within twenty years, so only the end-of-century claim is recorded as a forecast.
Source: Imagination and Change: Science in the Next Millennium · Clinton White House archive (NARA)
Should come true: 2100
How sure they sounded: I am confident ... probably much sooner
Categories: Technology
Importance: 4 of 5 · A complete unified theory of physics would be a landmark in human knowledge.

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