. >> you can read more about marian marianne's bowl picks on our website. >>> still ahead, drilling down. you will meet the entrepreneur who had the bright idea to heat whole homes by digging a hole. >>> using the earth's heat to heat and cool your home is energy efficient. but using a geothermal system means drilg down hundreds of feet. that costs alo less than 1% of homes use geothermal wsystems,ch can cost $50,000. that's why one bright entr areneur had bright idea she hopes will make them more affordable. becky meyers new gentlemenio thermal and heating system is shaking up her home economics. >> no more oil bills. >> reporter: last september myer and her partner, bob conners stopped paying $3,000 or $4,000 a year for heating oil. some of the savings covers higher electric bills.s some cover the monthly payments for the new system. the rest lands right in their pockets a. new furnace would have cost ,000 or $7,000. instead, myer paid about$20,000 for heat, air-conditioning, and two new hot watertanks. a lot lesshan she was quoted the year before. >> $37,000. it was too expensive. he>

. >> but then why was it so easy for tom to become intimate with marian marianne crandal so soon after like three weeks after dar's death. >> yes. >> and you're in the house were dar died. >> yeah. >> what am i do think of that? >> think that i don't care about what had just happened to my wife. that's not true. if i could go back and change it, i would, but i can't. >> this was an event that involved grief and a reaching out and it happened. >> do you love your wife? >> i love her very much. >> did you love her on february 7th, 2009? >> very much so. >> did you have anything to do with her death? >> not at all. >> before closing arguments, the prosecutor had one more card to play in the form of a surprise rebuttal witness who could unravel tom's alliby. >> out of the presence of the jury, dar's niece told the court that one week before dar was murdered, she went to the farm to babysit heath. >> she told us not to go out on the back porch without shoes because tom dropped a frame and there may be glass out there. >> the judge ruled amber's testimony was hearsay and therefore inadmissib