John Updike wrote this poem in 1960 about strange, ghost-like particles called neutrinos. But our knowledge since then has changed. For example, there are now three types of neutrinos — all of which certainly have mass. Read a simple breakdown by Fermilab spokesman Kurt Riesselmann in symmetry magazine. High-res

John Updike wrote this poem in 1960 about strange, ghost-like particles called neutrinos. But our knowledge since then has changed. For example, there are now three types of neutrinos — all of which certainly have mass. Read a simple breakdown by Fermilab spokesman Kurt Riesselmann in symmetry magazine.