Misc: What is the Jack of Hearts holding up in a deck of cards?

Questions

A 300,000 pound wedding dress made of platinum was once exhibited and in the instructions from the designer was a warning, what was it?

Who experimented with the idea of contact lenses?

In what year was the telephone invented by Alexander Graham Bell?

In what form are the signals that a normal TV aerial receives?

What is the name of an animal that can pass on bacteria without being affected by the disease itself?