Can the law change when circumstances change?

The doctrine of promissory estoppel:

Causes of contracts being discharged because of impossibility of performance include:

A breach of contractual obligations other than money, such as a contract to build a house, is referred to as ________.

When a contract is voidable:

A sales letter is an offer if:

A/n ________ beneficiary is one to whom the promisee owes no legal duty but to whom performance is a gift, such as the beneficiary named in a life insurance contract.

May the parties in a civil action normally represent themselves in court?

A mutual mistake as to value, quality, or price:

CERCLA imposes liability for cleanup of hazardous substances on: