What are the specific physical properties of a superconductor?

What is meant by the Meissner effect?

What distinguishes Type I and Type II superconductors?

Describe the BCS theory of superconductivity.

What is a Josephson junction and what is it good for?

What are the properties and applications of a SQUID?

Describe the properties of the Yttrium-Barium-Copper oxide type of high temperature superconductor.

Describe some of the current applications of high temperature superconductors.