It’s been a year since I came down with Type I diabetes, and everything is butter. The Dexcom G7 rides on the back of my upper arm, a smooth high-tech medical barnacle, whispering my blood sugar data to my cell phone, which reports a healthy 5.7 glycemic index. The insurance kinks have been worked out. Now CVS and Walgreens send me chirpy little texts announcing it’s time to collect bottles of pills and injector pens of insulin — those pens are a marvel, with their 4 mm lubricated needles. You don’t feel them going in.

But technology, no matter how wondrous, cannot conquer human blundering. Last week, for the first time, at bedtime I picked up the orange NovoLog Flexpen instead of the gray Lantus SoloStar for my nightly insulin shot. Twenty milliliters of the long-acting Lantus insulin is

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