Nate Walpole steadied his hand, readied his needle and issued a friendly warning.
“Sir, big poke!” Walpole said, holding the syringe in place for a few seconds before quickly pulling it out and tapping it on a nearby table, protective plastic flipped up over the needle.
On this particular day, the syringe contains only saline, injected into a pillow held in place on a classmate’s shoulder. But soon, it will be the real deal: the COVID-19 vaccine.