Pentaquarks, locked-in syndrome and more reader feedback

Behold the pentaquark

Quarks, the building blocks of protons and neutrons, travel in packs. Researchers at the Large Hadron Collider near Geneva caught a glimpse of two new five-quark particles, Andrew Grant wrote in “LHC reports pentaquark sightings” (SN: 8/8/15, p. 8).