You Filter the Milk

Zack loads a sample into the filtration machine and turns it on.

"It's got two filters in it," Zack observes. "See the stuff that can't get through the 10-micron filter? It collects in the F-Hundred bottle. The rest goes through and hits the half-micron filter. Whatever can't get through that ends up in the F-Five bottle. The stuff in the milk that's smaller than a half-micron ends up here, in the F-Zero bottle."

When the sample from Evil Milk A is done, Zack takes the bottles and labels them: F100A, F5A, F0A. Then, with a sample from Good Milk B, he repeats the process.

He ends up with bottles labeled F100A and F100B, F5A and F5B, F0A and F0B. You notice there's something in each bottle. "I'll put these all in for testing," he says, and disappears into the back room.

Continue investigating the biology lab

An Access Excellence Science Mystery sponsored by Genentech, Inc.