aturday crowd. ♪ [ male announcer ] the parking lot helps by letting us know who's coming.he carts keep everyone on the right track. the power tools introduce themselves. all the bits and bulbs keep themselves stocked. and the doors even handle the checkout so we can work on that thing that's stuck in the thing. [ female announcer ] today, cisco is connecting the internet of everything. so everyone goes home happy. >>> we are back with "sg md." the new year is a great time to mentally hit the restart button. that's what i call it. hopefully make some healthy changes to your life and maybe your loved ones as well and for many of you losing weight is at the top of your resolution list. we want to talk about that and a little bit and i want to welcome back the author of a new book called "the short guide to a long life." let's start with some myths, doctor. you say it's a myth that a little bit goes a long way when it comes to exercise and weight loss. how so? >> well, listen, i mean, the data with exercise and weight loss are very simple, it's movement over time. and so our b

aturday at 10:00 a.m. eastern. author gary young later asks examines the speech -- examines "the speech, the story behind martin luther king's dream." >> 300 years ago, the first pioneers crossed the ocean to a new frontier. the promise where a man could have his own acres, raise his children in freedom. yet in one of the great river valleys of america, something went wrong. in the tennessee valley, three nturies later, the l assemblance of the pioneers were a neglected people. for these children, the hope and the promise were dead. >> the tennessee valley authority was one of the early museum projects. it is a project and a concept that had been under consideration for some years before franklin roosevelt became president. frank noris of nebraska, senator, was looking to help improve the quality of life in the tennessee river valley to bring flood controls, to generate some electrical power, and to improve the lives of the people living in the tennessee river valley. it was one of the poorest regions in the countr