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Sounds s lot more fair than the experience I had at home!
Three kids crammed in front of one computer. One on keyboard, one on mouse and one on joystick. The one on joystick was at the worst disadvantage. A small nudge was a good way to sabotage rebuilding your fortress.
This cleared out a flea infestation in our dog. We use it preventatively because ticks, as well.
Fleas tend to linger because their eggs shed all over the place. As I recall, frontline had some double action going on by both killing fleas and causing their eggs to hatch into nymphs that never evolve into breeding maturity.
Fleas don’t really like biting humans, so any occurrence is a one+off.