Scientists accidentally kill world's oldest animal at age 507. The oldest animal ever known lived from 1499 until the day researchers cracked its shell open, killing it in the process.
For example, there is a federal law (and similar laws in every state) allowing consumers to cancel contracts made with a door-to-door salesperson within three days of signing. You might use that law after hastily agreeing to have someone repave your driveway, deliver lawn fertilizer, or put a new roof on your house.
That time frame can be shortened or run to the close of escrow in the contract. At the end of that time, if the buyer has not signed a release of contingencies, the seller can cancel the contract, after delivering to the buyer a Request for Buyer to Perform, giving the buyer 24 to 72 hours, typically, to perform. Buyers have options if a low appraisal was received. Releasing Loan Contingency.