The leaves of vetiver are a useful byproduct to feed cattle, goats, sheep and horses.

"Religious behavior may be a misfiring, an unfortunate byproduct of an underlying psychological propensity which in other circumstances is, or once was, useful," Dawkins wrote.

"A useful byproduct of our research into brain chemistry."

It collected water from the ship's fuel cells (a useful byproduct).

The only useful byproduct, perhaps, is that we get to see who's uncomfortable with concepts, or who oughta' be given a pulpit.

One useful byproduct of the oxychlorination is ethyl chloride, a topical anesthetic.

Lignosulfonates are a useful byproduct recovered from the spent liquor in the sulfite process.

One useful byproduct of this episode is that it may finally put to rest the idea that the Government pays for the press plane.

Microsilica is a useful byproduct.

Glycerol (glycerine) is liberated and is either left in or washed out and recovered as a useful byproduct, depending on the process employed.