Reading an old bike repair book from the 80s and found a weird detail about tire pressure

I was going through some old stuff at the shop and found a bike maintenance guide from 1987. It said for a standard 700c road tire, you should run it at 95 to 105 psi. I checked that against a modern chart from a big tire maker's website, and now they recommend 70 to 90 for the same size. That's a drop of like 25 psi on the high end in less than 40 years. I guess the thinking on rolling resistance and comfort has really changed. Has anyone else noticed this shift in recommended pressures over their career?

I used to think the moon landing was fake until I saw a documentary in my college astronomy class last semester

I finally got a stubborn door operator to sync up by using a laser level

We had this old Dover unit in a building downtown that kept having the doors close out of time. I tried adjusting the cams and checking the belts for two hours with no luck. Out of ideas, I set up my DeWalt laser level on the floor to project a straight line across both door panels. Watching them move against that line showed me one side was lagging by about an eighth of an inch. A tiny tweak to the linkage arm on that side fixed it right up. Has anyone else used a laser for door alignment instead of just the marks on the track?

My $40 'smart' plant sensor just told me my cactus needs more water, which is how I know it's completely broken.

Has anyone found a reliable gadget that actually works for succulents, or should I just go back to poking the dirt with my finger?

TIL the difference a proper pre-dive check on my Kirby Morgan helmet made after a silt-out in Lake Michigan last Tuesday.

The seal I'd been rushing through for months held perfectly when visibility dropped to zero, which kept me calm enough to follow the line out, so has anyone else had a simple check save them from a real panic situation?

Vent: My coworker at the farmers market in Portland dumped my whole kombucha batch

I was showing my setup to my friend Mark last Saturday, and he just grabbed a jar, said 'this smells off,' and poured all 3 gallons down the drain. He didn't even ask first. I'd been brewing it for 8 days and the scoby was perfect. Has anyone else had someone ruin a project because they thought they knew better?

Finally bought a $150 thermal camera for my phone to find heat leaks in compressors, and it's already paid for itself.

Remember when finding a quiet cafe in Bangkok meant showing up at 7am?

I got so tired of fighting for a table with a plug that I started checking Google Maps for barber shops and small gyms instead, and now I book their back rooms by the hour for less than a coffee a day. It's way quieter, the wifi is solid because they need it for their business, and I'm not fighting tourists for space. Anyone found a similar hack in Mexico City or Lisbon?

My roommate in college swore by using the same password for everything, said it was easier to remember.

I listened to him for a while, using one password for my email, social media, and even my bank account. Then a sketchy gaming site I signed up for got hacked, and my main email got flooded with spam and login attempts from Russia. I had to spend a whole weekend changing passwords on like 50 different accounts. Anyone else have a friend who gave them really bad security advice?

Can we talk about how Gen Z thinks side parts are a crime

My 17 year old cousin literally told me my hair was 'giving millennial' because I have a side part, and she said it with a straight face like she was reporting a felony. I've had this part since I was 12 and it works for my face shape, but she acts like it's a historical artifact. Do we really need to gatekeep HAIR now?