Happy Birthday Nelson

Today is my friend Nelson’s birthday. Hopefully he’s enjoying it despite his wife (Tammy) being in the hospital for some kind of relapse. He didn’t sound very serious in the e-mail but I’ll find out more when I call him to wish him well. 
 
If you know Nelson, drop him a line to wish him a happy birthday. He’s lucky, as you see from the earlier entry, he shares it with the man who displaced Sir Isaac Newton for contemporary physics and a mathematical constant. I can’t think of any cool math constants based upon 7.29, can you?