Some days are really tough, and this definitely is one of them. My dear friend John Martellaro passed away today. John is one of the smartest people I've ever met and had the kind of resumé most of us can only dream of. He was an astrophysicist. He worked for NASA.

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@jgamet I’m very sorry to hear about John. I always enjoyed hearing him as a guest on TDO. He was a good one and will be missed.
@bcanedy I always loved having him on. Fun behind the scenes trivia: He always tried to get me to say the wrong date at the beginning of the show and took great delight in the few times it worked. He’d laugh and laugh.