Jim Van Etten has stood in the crowd during a trove of presidential speeches. Kennedy in 1960, Carter in 1980, Clinton a year ago in Lincoln.
The University of Nebraska-Lincoln plant pathology professor heard Obama speak twice at the National Academy of Sciences annual meeting.
But it wasn't until this year — April 22 to be exact — that Van Etten took to the political podium himself.
That day, scientists and others around the world took up their picket signs for the March for Science.