Four piles

After a few hours
"I'm telling you, this a purely biological device," Cerebrum said, pointing
at the object in discussion.
"And I'm telling you that it's only got a few biological components, but is
mainly electrical in nature," Keto snapped back. "I'm a doctor, I know."
"I'm a doctor too, and I say you're wrong," Cerebrum replied. "And I'll
prove it too!" He pulled out a screwdriver and stuck it in the innards of
the device. There was a brief zapping sound, and then Cerebrum pulled
himself back up into his chair, occasionally discharging small bolts of
lightning into it.
"What do you know," he said, woozily. "You were right."
A few more hours later
"Okay," Keto said. "We've divided all of the recovered equipment up into
four different piles."
"Stuff we can sell for a profit, stuff you want to keep, stuff you want to
keep and stuff we should give to the captain to help save the ship,"
Cerebrum further clarified for the benefit of the readers.
They both craned their heads at the fourth pile. "A condom dispenser and a
half-empty jar of mayonnaise that's been left open so long it could
conceivably be used as an acid. Or nuclear fuel." Keto commented.
Cerebrum shrugged. "We have to give them something."