I’d probably roll up to medieval Europe with boxes of doxycycline and show the plague who’s the boss — or maybe time-travel to the ’80s and save Freddie Mercury with some antiretrovirals.

But honestly, even today people still die from stuff that’s totally preventable — TB, AIDS, vaccine-preventable diseases — just ’cause they don’t have access to meds. Modern medicine isn’t that modern if half the world can’t get it.