Misc: In the early Twentieth century, rattlesnake venom was used to treat _____?

Questions

Which amendment is the 'lame duck' amendment?

Which American president holds the record for the most consecutive hand shakes at an official function?

Which American president is credited with the plan of 'vietnamization'?

Which amusement park opened near los angeles in 1955?

Which ancient continent is said to be submerged?