This text is missing some spaces, please add them: ineachapartment,theyinviteyoutorelaxandunwind.
in each apartment, they invite you to relax and unwind.
This text is missing some spaces, please add them: So,ifIrememberright,thesetofallpositiveintegersisthesamecardinalityasthesetofall(positiveandnegative)integers.
So, if I remember right, the set of all positive integers is the same cardinality as the set of all (positive and negative) integers.
This text is missing some spaces, please add them: Oursurvivalmightdependonit.
Our survival might depend on it.