NASA's oldest active astronaut is also one of the most curious humans
Briefly

NASA astronaut Don Pettit epitomizes curiosity as he sacrifices his personal beverage allotment for unflavored gelatin to conduct scientific experiments aboard the International Space Station.
Each astronaut of NASA has a structured programmatic side to their research, which is organized and follows a specific protocol. Yet, there lies another aspect — the unplanned, spontaneous research he refers to as 'science of opportunity.' This includes experiments sparked by inspiration in the moment or the serendipitous chance of materials that happen to be available.
Read at Ars Technica
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