Mid 40s, and I too feel old now - at first I thought OP was setting us up for a joke. The local phone company still delivered phone books to everyone in my city until a few years ago.

I think it was an old legal requirement for any phone company providing landline services to also provide phonebooks. Unfortunately most weren’t even recycled, they were either burned in backyard firepits, or just thrown out

The microplastics in my body laugh at arsenic’s petty attempt on my life!

TIL - Light Amplification by Stimulated Emission of Radiation

That reminds me, so is SCUBA, RADAR and MODEM…I miss the old History Channel shows, especially Modern Marvels

SCUBA: Self-Contained Underwater Breathing Apparatus (Blew my mind for some reason when I learned that)
RADAR: Radio Detection and Ranging (I’ve watched alot of WWII documentaries)
MODEM: Modulation Demodulation (I’ve worked in tech)