At least 4 people are dead and 14 injured after a workplace shooting at Excel Industries in Hesston, Kansas. Authorities have called in the FBI to assist in the investigation as they identified the shooter: Cedric Ford. CBS News’ Elaine Quijano has the details. Source

Former Republican presidential candidate Mitt Romney suggested Wednesday that a “bombshell” is waiting in Donald Trump’s tax returns; A Los Angeles teacher may have come up with the solution to a math problem that has stumped the best minds for centuries: How do you get school kids to succeed at calculus? Source

Dr. Francis Collins, Director of the National Institutes of Health, is leading efforts to gather a one-million-person database of health and genetic information which could lead to more targeted, personalized treatments. He spoke with CBS News chief medical correspondent Dr. Jon LaPook about the Precision Medicine Initiative and the future of health care. Source

Heart problems account for three-quarters of sports-related deaths in young athletes. Now a first-of-its-kind study examining the hearts of NBA players could help save lives. Dr. Jon LaPook reports. Source

In this web extra, the Academy Award-nominated star of “Brooklyn,” preparing to make her Broadway debut in Arthur Miller’s “The Crucible,” runs through a scene with the help of correspondent Jane Pauley (who acts out all the other parts). Source

The Centers for Disease Control and Prevention says this year’s vaccine was 59% effective. With more, Dr. Nesochi Igbokwe from the New York University Langone Medical Center joins CBSN. Source

Research finds that long, intense exercise can lead to heart abnormalities. Dr. Nesochi Igbokwe from the New York University Langone Medical Center joins CBSN to discuss. Source

A 60-year-old woman in Britain wants to carry the frozen eggs of her deceased daughter who died of cancer. She hopes to give birth to a grandchild. A court is allowing the woman and her husband to appeal a ban on their efforts. CBS News legal expert Rikki Kleiman joins “CBS This Morning” to discuss the case. Source

Dashcam video from a Minnesota state trooper shows a semi-truck being slammed and dragged by an oncoming train. The driver only suffered a slight injury. CBSN’s Contessa Brewer has more. Source

A security flaw in some wireless mice could allow hackers to take over your computer. CNET’s Lexy Savvides reports. Source