Jackie Robinson, who paved the way for black baseball players by being the first black player in the MLB, actually has his own day, commemorating his debut with the Brooklyn Dodgers. It was on April 15th, coincidentally the very day the Jeopardy episode aired.
Plenty of people on Twitter had a lot to say about Ying's misstep.
Ying was undeterred by the error though - she wound up winning and moves on to the final round of the College Tournament which airs tonight and tomorrow.