so it turns out on this kelvin scale, we don't even say kelvin degrees. we just say kelvins. i mean, kelvin was really honcho, okay? these are all kelvins, all right? on this kelvin scale, the point at which ice melts would be 273 positive. see, with the kelvin scale, there's no negative numbers. everything is positive. ain't that nice? see? and then the temperature of boiling water is 373 because they have made the kelvin scale, the scientist-types, so that it has the same divisions as the celsius scale. but absolute zero is 273 degrees under there. so if we have that ice coffee that's, say-- let's take something that won't change state because it turns out the ice coffee, something will happen to it when it gets up to 100 degrees celsius. what will it do? boil. it will start to turn into steam, see. but let's suppose you had like a piece metal. i have this metal here at zero degrees. and i make it twice as hot, twice the internal energy. see if your neighbor knows what would the temperature be in celsius of this piece of iron bar twice as hot as zero degrees. check your nei

it just doesn't make sense. >> reporter: kelvin first realized something was terribly wrong when hisife did not pick him up from the airport. >> i kept calling her many times, many times, 15, 20 times. she did not respond. i said something is wrong. >> reporter: he finally called a neighbor, who found susie dead in the house on ash court. >> she was lying in the house. there was the indication of traumatic injury. >> reporter: family members say it appears somebody came through a back sliding glass door that was unlocked. susie was attacked. her car stolen. a blue 2011 subaru outback. while police search for answers, friends and family members met for a candlelight vigil, remembering the woman who was one of the founders of the chinese association of hercules, a woman who loved garden, was happy, and lived in this house where she died more than 30 years. >> we're here to honor here. she was a great woman. >> reporter: you can see there's a board where the front door used to be. police took it as evidence. at this point, they have no leads and have made no arrests. in hercules, cbs 5.

i can't wait for kelvin to get home. >> kelvin was her husband?> yeah. >> police admit they have no motive or suspects in the homicides, which has now left this once quiet cul-de-sac on edge. >> police in east palo alto investigating two deadly shootings there that happened blocks and hours apart. the first what as 8:20 last night. police say 21-year-old christopher baker died after being shot several times. the second shooting scene is three blocks away. 24-year-old lonnie brown was shot to death just after 11:00 last night. >>> under the roar of neat week celebrations in san francisco, war protesters are marking the anniversary of the longest armed conflict in u.s. history. >> if we don't get in justice, you don't get no peace. >> the invasion of afghanistan started 11 years ago tomorrow. hundreds of marchers in downtown san francisco called for troupe withdrawal and was a mostly peaceful demonstration. witnesses say a window was lone broken accidentally in a building when the occupant tried so shut it. >> residents in a san mateo neighborhood a

and the kelvin scale is named after some dude by the name of james j... - scale. - ...scale, you got it. you got it, all right. so we have those kinds of ways of measuring temperature, the average kinetic energy per molecule of things. here's a nice distinction between temperature and internal energy, or, loosely speaking, heat content. this used to bother me when i was a kid. you know those 4th of july sparklers? you light them and they-- [makes noise] --and all those white hot sparks going out. and do you know whathe temperature of those sparks are? -- more than 1,000 degrees celsius, more than 1,000 degrees. is that hot or cold? - hot. - cold. "h," no, no, no, begin with a "h." [laughs] hot, okay. those are hot sparks, gang, over 1,000 degrees celsius. ever see little kids with those little sparks at home, like, hey, look at sparkler, honey, that's gonna dance sparks bouncing off the kid's eyeballs and his cheeks and everything. and the kid-- does the kid scream? the kid's okay. and i said, "wait a minute. "the temperature of those sparks is white hot temperature, enormously high

. >> after being deployed in afghanistan for a year, staff sergeant kelvin sanders surprised his sonhe game. >> he's amped upped and excited and i wanted him to have the full experience of a welcome home. >> the name of staff sergeant kelvin sanders was called before the coin toss. it was the first time the father and son saw each other without a computer screen in a year. >> i saw xavier's face light up and he was so surprised. >> it's pretty tough. real emotional. so, i don't know. turned out pretty good. >> those who saw it were moved, as well. >> it's just beautiful. something i've always seen on tv but never had a chance to see in person. makes me proud to be an american and i feel very privileged. >> now his dad says the privileges will go to xavier, another reason for him to keep dancing. >> whatever he want to do, wherever he want to go eat, wherever he want to play, let him enjoy himself. >> we play on the week and we played board games. >> it's definitely going to be a whole new world for xavier to see his dad constantly. >> cute! good for them. >> stay with us, more news c