NASA astronaut Chris Williams activates sample‑containing tubes for student‑designed experiments

iss074e0590901 (May 18, 2026) --- NASA astronaut and Expedition 74 flight engineer Chris Williams activates sample‑containing tubes for a variety of student‑designed experiments using NanoRacks research hardware. The tubes were filled with biological and material samples to help expand knowledge of space phenomena and inspire junior high and high school students to consider scientific, technical, and engineering careers. Credit: NASA/Jack Hathaway