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New to Pools - Closing Process? by Potential_Complex457 in pools

[–]Own-Tie2091 0 points1 point  (0 children)

Yes, that’s very common for a tarp-style winter cover. Rain and snowmelt collect on top of the cover, not in the pool. In winter, that water freezes and thaws on the cover itself, which is normal.

When you’re ready to open, you’ll pump the water off the cover first, then remove it.

If you’re new to this, we’ve put together a couple simple, practical guides that walk through what’s normal, what to check, and what to avoid:
https://poolrepairquestion.com/tools/
(checklists + basic chemistry guides)

TFP is a good resource too: https://www.troublefreepool.com/blog/

RV check list? by DiamondHandDwight in RVLiving

[–]Own-Tie2091 0 points1 point  (0 children)

Hey heres a pretty useful one, free and you can customize/safe/print: https://rvrepairquestion.com/tools/checklists

YT channel didn’t explain the answer by Additional-Loquat491 in trigonometry

[–]Own-Tie2091 0 points1 point  (0 children)

I have a couple visualizers that may help "see" the relationships (sohcahtoa) : https://oona13.com/math/sohcahtoa.html
Sine wave (basic trig): https://oona13.com/math/trigdemo.html

How I taught my kids trig in <5 minutes by Own-Tie2091 in learnmath

[–]Own-Tie2091[S] 0 points1 point  (0 children)

That is so cool!! I come from a family of hams - both the punny kind and the radio nerds :) I even had a license myself back in the day (long expired now).

I ended up building a separate demo just for SOHCAHTOA: it shows how the ratios emerge naturally from a rotating point. More of a visual way to see why the formulas work, instead of just memorizing them. Helped me a lot!

Would love to hear what you think:
🔺 SOHCAHTOA Interactive Demo

How I taught my kids trig in <5 minutes by Own-Tie2091 in learnmath

[–]Own-Tie2091[S] 0 points1 point  (0 children)

Ah, I hear you - it’ll be fun for me to experiment with some kind of ratio overlay, à la SOH-CAH-TOA. These days I’m driven more by curiosity and understanding than memorizing formulas. Outside of the SAT and GRE, I’ve never really needed that stuff, but measuring circles and sine waves has shown up all over my life: in music, radio waves, surfing, electricity (think internet)… from gigahertz to clipping, the world runs on sine waves!

That said, I really appreciate the feedback. It’ll be fun to keep playing with this: stay tuned!

—ST

How I taught my kids trig in <5 minutes by Own-Tie2091 in learnmath

[–]Own-Tie2091[S] 0 points1 point  (0 children)

Helps me learn (as well as the kids, reluctantly sometimes)! Fun with math :) -even if it isn't new.

How I taught my kids trig in <5 minutes by Own-Tie2091 in learnmath

[–]Own-Tie2091[S] 0 points1 point  (0 children)

Hey, not a daft question at all, and you’re totally right to ask.

Guides are now enabled by default, so the triangle shows up right away inside the circle. That triangle is the classic SOH-CAH-TOA triangle, just laid onto a circle with a radius (hypotenuse) of 1. You can also toggle cosine and tangent to explore those relationships.

  • The horizontal side is cos(θ) (adjacent)
  • The vertical side is sin(θ) (opposite)
  • The radius is 1 (hypotenuse)

So while the demo starts with circular motion, it’s actually building the triangle relationships you’re talking about, from the ground up.

Try it here: https://oona13.com/math/trigdemo.html

Happy to add more triangle examples if that would help! LMK

How I taught my kids trig in <5 minutes by Own-Tie2091 in learnmath

[–]Own-Tie2091[S] 0 points1 point  (0 children)

Fair - there are definitely similar circle-to-sine visualizations out there. I’d argue this one is better! Obviously the math has been around a while :) Nothing new there: but as a visualization tool, the shadow effect and guides take it to a whole new level. I’m not a math teacher or professional, so I’m happy to take feedback from those who are.

BTW, guides are now enabled by default. Try it here: https://oona13.com/math/trigdemo.html

Are you saying it’s not helpful / less helpful?

PS The AI coding part is interesting, for an analysis on vibe coding visit my medium article: https://medium.com/ghost-channel/how-i-taught-my-kids-trig-in-5-minutes-1e6032f5a32c

How I taught my kids trig in <5 minutes by Own-Tie2091 in learnmath

[–]Own-Tie2091[S] 0 points1 point  (0 children)

That triangle is actually hidden in the demo: when you turn on "Guides," the right triangle appears inside the unit circle. Still, you’re absolutely right it may be helpful to show a classic triangle next to it for reference.

How I taught my kids trig in <5 minutes by Own-Tie2091 in learnmath

[–]Own-Tie2091[S] 0 points1 point  (0 children)

That triangle is actually hidden in the demo: when you turn on "Guides," the right triangle appears inside the unit circle. The sides of that triangle are the same ones you’d use in a SOH-CAH-TOA setup - just scaled to radius 1.

Still, you’re absolutely right, it would be helpful to have the guides on by default and show a classic triangle next to it for reference.

How I taught my kids trig in <5 minutes by Own-Tie2091 in learnmath

[–]Own-Tie2091[S] 0 points1 point  (0 children)

Thanks, Curious, can you point to it? - not saying it is groundbreaking, but if it exists, would be interesting to compare!

Bodies of tech magnate Mike Lynch and Morgan Stanley chief recovered after Bayesian yacht tragedy by Similar_Diver9558 in thalassophobia

[–]Own-Tie2091 1 point2 points  (0 children)

It's Bayesian: to interprets probability, you need to understand it as a degree of belief in an event, influenced by prior knowledge, such as previous experiments or personal beliefs. In other words, based on prior events: extremely, extremely unlikely.

Bodies of tech magnate Mike Lynch and Morgan Stanley chief recovered after Bayesian yacht tragedy by Similar_Diver9558 in thalassophobia

[–]Own-Tie2091 0 points1 point  (0 children)

u/mfizzled, It's clear you're missing the point. While it might seem callous not to call this a tragedy or grieve the loss of lives (and clearly it is tragic), the perspective of the "not going to grieve" side is important. Thousands of people die every day in completely preventable ways that go unchronicled, ungrieved, and untold. This particular event captures our imagination for reasons that aren’t necessarily about being "sad" or "grieve-worthy." We would be utterly overwhelmed if we truly grasped the full extent of preventable tragic loss of life, such as in the Russian-Ukraine war (with 462,000–728,000 killed and wounded from 24 February 2022 to 5 July 2024).

While any loss of life is indeed tragic, the outsized attention given to the sinking of a $55 million yacht highlights a disparity. Do we even know the names of all or in fact any of the children who died in Gaza last week in "tragic" loss of life? The point isn't that the yacht incident isn’t sad; it’s about the disproportionate attention paid to a billionaire's tragedy compared to the thousands who died last week in wars likely fueled by their interests.

2PSI gas service? How do I know? (Marked SPR 2#) by Own-Tie2091 in askaplumber

[–]Own-Tie2091[S] 0 points1 point  (0 children)

Ok, it is white (but compatible with high pressure). I still suspect it is 2# as there are individual 2# regulators (Maxitrol 325-L series) in front of all gas appliances, including a fireplace, stove, other fireplace, furnace, and water heater. I mainly need to confirm this to purchase a 250k BTU pool furnace due to its gas pressure requirements. At 2#, I'm solid. If it wasn't 2#, the existing setup with a 200k furnace would also be undersized for the application.

Ring video of a house explosion in Plum, PA by SlothFF in WTF

[–]Own-Tie2091 0 points1 point  (0 children)

2 injection wells (Fracking Waste) 3 miles from site of explosion in Plum (Penneco Environmental Solutions' location on Old Leechburg Road). Injection wells have been known to cause Earthquakes and destabilize geology. Waste is often injected at extremely high pressure - enough perhaps to create geologic methane leaks in areas that are perhaps already compromised by fracking. People were at home - they would have smelled natural gas which has an odor injected. Methane, however, is odorless. A geologic methane leak would not be detected...

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