So, I haven't gone on a rant for some hours now, but I have a semi-serious lament. Here's the setup. The other day, I was trying (!) to teach some students about simple dc circuits and they managed to wallop almost every flashlight bulb in my kits. So, I wondered off to the nearest hardware store (oops, all our hardware stores have been put out of business by the big box stores) home building supply store. I was wandering down the electrical aisles looking for bulbs when a seemingly nice, middle-aged lady clerk walked up.
"Can I help you find something?"
"Yes, where are the flashlight bulbs?"
"What size batteries do you use?"
Me, a little louder (maybe she's hard of hearing) "No, I don't need batteries. I want some number 13 flashlight bulbs."
"How many batteries does your flashlight use?"
"No, I want bulbs. 3.7 V, 0.3 A, minature screw base, flashlight bulbs."
"Well, I can't help you if you don't know about your batteries. Are they rechargable?"
"I"M NOT USING BATTERIES! I WANT THESE BULBS FOR A 3 V POWER SUPPLY."
"Oh! Well, you can't use flashlight bulbs for that. You need regular bulbs."
And this in Pittsburgh, once the workshop of the world!

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