“When I learned how to do the Gram stain in microbiology.”

— Natalie Redding, retired medical technician, Lawrence

“Probably the volcano that spewed out when I was a sixth- or seventh-grader. It made a mess.”

— Gary Wilson, substitute teacher, Grandview, Mo.

“When I made a solar oven my junior year of high school, I met my best friend, Arna. He was my partner.”

— Bonnie Toplikar, student, Lawrence

“Identifying trees based on leaves. We put them in a scrapbook.”

— Nicholas Goss, artist, Lawrence