TY - BOOK AU - Niven,David TI - The 100 simple secrets of the best half of life: what scientists have learned and how you can use it SN - 0060564733 (pbk.) AV - HQ1059.4 .N58 2005 U1 - 158.1084/4 22 PY - 2005/// CY - [San Francisco] PB - HarperSanFrancisco KW - Middle-aged persons KW - Psychology KW - Conduct of life KW - Older people KW - Happiness KW - Optimism KW - Optimism in older people N1 - Includes bibliographical references (p. 201-209) ER -