Calves, cacti, and children are irregular plurals.

After submitting to biometric hand scans in the lobby and passing through a sensor-laden multidoor man trap, Manos and I entered a bright, white room filled with librarylike rows of hulking, black racks of servers — the dedicated hardware that drives the Internet.

Jen sports with Bill's emotions.

[…] substance which Graine knew to be 'witch-meal'; the seeds of dried lycopodium moss; the other set the dust on fire with a burning stick, the flame pursuing the flying particles till they were consumed, when the light flashed out[…]