(This means that, for instance, a magnet attracts a nail because both objects exchange photons.)
(This; means; that, for instance, a magnet attracts a nail because both objects exchange photons) Context(This means,List([1, 11))):(a magnet; attracts; a nail; because both objects exchange photons)
This means,List([1, 11))
This a magnet
means attracts
that, for instance, a magnet attracts a nail because both objects exchange photons
a nail because both objects exchange photons