What is the smallest possible thing in the universe?

Science's ongoing quest to find the smallest possible things remains tantalisingly incomplete.

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To the relief of physicists, time really does have a preferred direction.

Fermilab physicists present their reworked plans for giant neutrino experiment

The underground tunnel where the laws of physics are rewritten

Thirty feet beneath the hills of Menlo Park, scientists at SLAC have worked for the past half century to alter our fundamental understanding of the universe.