It is possible to determine the time a cell spends in different phases of the cell cycle and its specific location in the cycle by feeding cells with molecules that are only taken into the cell at a specific point in the cell cycle.
It's known as the Big House, and that's not just a cute nickname. It's a literal one. The largest crowd to ever attend a college football game (115,109) did so in 2013 at Michigan Stadium, when Notre Dame made what might be its final visit to Ann Arbor and fell 41-30 to Michigan.
So exactly how many people watch the biggest game in American sports? Last year's Super Bowl drew the largest audience in American television history, averaging 111 million viewers. All total, 163 million people watched at least part of the game. That's more than half of the population.