Mr. Smith goes to the doctor's office to get his wife's test results. The lab technician says to him, ""I'm very sorry, sir, but we've had a bit of a problem. At the same time we sent your wife's samples to the lab, the lab also received samples from another Mrs. Smith, and now we're not sure which results are your wife's. But, frankly, it's either bad news or terrible news!"" ""What do you mean?"" said Mr. Smith. ""Well, one Mrs. Smith tested positive for Alzheimer's, and the other Mrs. Smith h…