Your heart pumps your blood around your body, all hours, every day of the week, to keep you alive. Your heart is about the size of your fist, and it’s made of special muscle called “cardiac” (KAR-dee-ak) muscle. Cardiac muscle lets your heart keep the beat, it can also speed up or slow down, depending on what your body needs. Your heart works like an automatic pump – it squeezes, or contracts, and un-squeezes, or relaxes, to push blood through the four different sections of your heart. Valves, special one-way openings, are like little doors between the sections – making sure your blood moves in only one direction through your heart, to your lungs, back to your heart, and then around your body again.
Tia is messin' with everybody's minds when she tries to apply techniques she learned in psychology class to Tamera, Ray and Lisa when she discovers that Ray and Lisa have exchanged valentines; Tamera goes to the Valentine's Day Dance with Roger after she is jilted by the boy she originally asked.
Looking after Paige's boyfriend's daughter for the weekend, Ellen is proud of the way she communicates with her charge. But when the fourth grader asks Ellen about sex, she's tongue tied.
A hold-up man shoots Skalany in a small-town diner, but the real bad guy is his boss---a U.S. Marshall.
In the middle of nowhere, the company finds the hidden city of New Olympus, where the creatures of Greek myth have retreated, and humans are outlawed.
In Norway, the company is met by a mysterious one-eyed man who wants the Eye of Odin. When Goliath refuses to give it to him, he says they will regret it... especially Elisa, who isn't dressed for the cold.
Mark wants to take flying lessons, but Jill doesn't let him. Jill takes piano lessons. Meanwhile, Tim and Al ruin Bud's car.
The arrival of Diane Chambers in Seattle puts Frasier on an emotional roller coaster ride.
Dan weighs the merits of giving up his boring garage job for a new construction endeavor with his pals; Jackie surfs the internet and becomes addicted.
Russell gets a lawyer for her mother. Simone and Sipowicz investigate the shooting of a known mobster's son. Suspicion falls on his younger brother, but the father interferes with the search. Medavoy and Russell get a call to where a woman has been shot, while in bed. Her son tells Russell that he got a message, from his step-father, confessing to the shooting. His rich step-father's lawyer makes difficulties.
Moesha offers Hakeem a little encouragement--and her dad's Armani suit--for his job interview.
Christine needs to cheer up Hayden after a doctor connects his diminished sex drive to "male menopause."
In the distant past, Adam searches across Korea for his Zeo Crystal.
Brian falls in love with a woman while flying her to Nantucket for her wedding. Meanwhile, Antonio has mixed feelings after finding out Roy is dating Edna, "The Big Faced Girl."
Dick discovers the emotion of jealousy when Dr. Albright's old boyfriend returns to visit on a promotional tour of the novel he dedicated to her. Harry adopts a stray dog.
Hercules promotes peace by organizing an athletic competition between the warring Spartans and Eleans, thus creating the Olympic Games.
When her dead love Marcus, asks Xena to help save good souls, she travels to the underworld to set things right.
Ka-boooom! That explosion you hear is Philip and Vivian's marriage after Philip decides to go into politics.