Misc: who was born on krypton?

Questions

The smallpox vaccine was invented in 1763, 1784 or 1798?

The spaceship voyager found geysers on triton, a moon of which planet?

The still of the nite what's the location of the "circus hall of fame"?

The stone what dietary problem were 65 percent of brazilians suffering in 1985?

The study of inland water is known as?