Highs and Lows: Kerry Sanders saves dolphins, kid mows White House lawn

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Willie Geist and Kristen Welker run through the Highs and Lows of the week, including the nun who used a chainsaw to clear trees after Hurricane Irma blew through Florida, NBC’s Kerry Sanders saving two young dolphins live on air, the 11-year-old who mowed the White House lawn, and the man who dropped a ring into a pond as he was proposing to his girlfriend.