Bananas Enough for Time Travel?
-------------------------------

This paper argues that the most famous objection to backward time travel can
carry no weight.  In its classic form, the objection is that backward time
travel entails the occurrence of impossible things, such as
auto-infanticide---and hence is itself impossible.  David Lewis has rebutted
the classic version of the objection: auto-infanticide is prevented by
coincidences, such as time travellers slipping on banana peels as they attempt
to murder their younger selves.  I focus on Paul Horwich's more recent version
of the objection, according to which backward time travel entails not
impossible things, but improbable ones---such as the string of slips on banana
peels that would be required to stop a determined auto-infanticidal maniac from
murdering her younger self---and hence is itself highly improbable.  I argue
that backward time travel does not entail unusual numbers of coincidences; and
that even if it did, that would not render its occurrence unlikely.