Paul is supposed to call his mother every day.

[T]hat such Shows should be prohibited is very rational & proper—it is however curious to see how little forbiddance is necessary; for these Superstitious Brutalities die away of themselves gradually […] .

My garden requires regular weedings.

In a hollow-core design, neutrons escape from the core more readily, allowing more fissile material to be used (and thus allowing for a greater yield) while still keeping the core subcritical prior to detonation.