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>> sources tell cbs news a judge ruled that former vice president mike pence must testify before a federal grand jury investigating january 6th. ♪ ♪ >> officials pinpoint killed more than three at a migrant detention center in mexico. ♪ ♪ >> norah: a cbs news investigation. female athletes are more likely to suffer concussions. so why is there so little research? >> do you think enough is known about concussions and women sports? >> absolutely not. ♪ ♪ >> norah: and during this final week of women's history month, the inspiring life of a civil rights icon. >> i thought my...

And that is where cbs's ramy inocencio is tonight. >> reporter: ask and receive. ukraine hyped the first british and german tanks to arrive. britain matching the publicity. ukrainian soldiers trained in the u.k. the past several weeks. far from any spin and halls of power, these walls of dirt are the homes of ukraine's 209th battalion serving in the harkey region. on the border, a mind with russia. weary soldiers watching the tree line, waiting for movement. >> more. >> reporter: their commander's call sign lynx. how concerned, how fearful are you that this might escalate to nuclear war? >> i ...