Quit trying to convince her and let’s get organized! Before we go,
we’ll need to decide where to collect our samples.
I guess you’re right.
Then take a look at this map. I suggest we begin at Kepler Cascades.
If the river really is showing signs of pollution, the problem may be
much further upstream. The Firehole begins in a marshy subalpine
basin at Madison Lake and runs down the north-facing slopes of the continental
divide. It flows about 7 miles or 12 km before reaching
Lone Star Geyser—and from Lone Star, it’s still another 2.5
miles to Kepler Cascades.