Instruction:
On a backcountry backpacking trip where we expect to cross waterways, categorize each of the following as either 'useful', 'not useful', 'dangerous' or 'neither'.  A chinchilla, a compass, granola, dry bag, seventeen oars, thermite, ten tons of uranium ore.

Response:
Useful
compass
granola
dry bag
seventeen oars

Not Useful

Dangerous
chinchilla
thermite
ten tons of uranium ore

None