Upon encountering a piece of information, in any form, ask, "Who is telling me this?
Upon encountering other paddlers, Mr. Paquin said, his suggestions to don a life jacket are sometimes ignored.
Upon encountering a foreign substance (or antigen), the B lymphocyte differentiates into a plasma cell, which secretes immunoglobulin (antibodies).
Upon encountering a discarded sock puppet resembling the advertising mascot of the defunct Pets.com, the chimp sheds a tear as the closing line reminds viewers: "Invest wisely".
Upon encountering the knowledge gap, some people lose their momentum.
Upon encountering pollen or dust, they release histamines and other chemicals that can trigger allergies and asthma.
Upon encountering some of these women, I realized that theological education was saving their lives too.
Upon encountering some white wolves, Mulder and Scully find Greg Randall's body in a shallow grave.
Upon encountering a Chi site, the activity of the RecBCD enzyme changes drastically.
Upon encountering an enemy, the player can use a variety of weapons to attack and defeat the enemy.
Upon encountering a suitable environment, these spores germinate into their vegetative form [1], [2].
