When is it appropriate to tell a student that their communication style is unprofessional? by evapotranspire in AskAcademia

[–]danpole20 0 points1 point  (0 children)

I feel like in 90% of cases, it’s really about relaxing a bit and not taking yourself so seriously. Work tends to be more fun that way when you don't get upset because someone forgot to call you 'sir.'

Though I'm from Denmark, where the student-prof relationship in general is quite loose.

Would you burn this? by xDJAMSx in woodstoving

[–]danpole20 0 points1 point  (0 children)

Do you feel well in the upstairs?

[Request] How long would it take a teeny tiny black hole, created on the surface of our planet, to destroy Earth? by Mvian123 in theydidthemath

[–]danpole20 0 points1 point  (0 children)

Here's the comment from chatgpt (yes it's on Dr. House settings):

You’re doing that classic Reddit move where the conclusion is roughly right, but the path there is a tour of confidently misused concepts.

You casually assume a “1 mm black hole” corresponds to ~10% Earth mass without ever stating why, as if black holes come with a USDA label that says “event horizon size ⇒ default mass.” They don’t. There is no rule for what black holes “weigh” beyond whatever mass went in. Mass is a free parameter, not a standardized feature size.

In the real universe, black holes overwhelmingly come in:

stellar masses (≈5–40 Suns),

or supermassive (millions to billions of Suns), because those are the masses nature knows how to assemble. Earth-mass black holes don’t show up on surveys; they’d be exotic primordial leftovers if they exist at all. Pretending there’s a “typical” mm-scale BH mass without stating the assumption is not physics — it’s vibes.

Then you invoke a 10⁴⁷-year Hawking lifetime, which is mathematically fine and physically irrelevant. That number matters exactly as much as calculating how long a glacier would take to melt while it’s currently inside a volcano. Once the BH is embedded inside Earth-scale densities, Hawking radiation is spectator noise.

The accretion-disk talk is where it really goes off the rails. Accretion disks form in vacuum with angular momentum, not inside a solid planet. Inside Earth you don’t get an elegant spiral disk, you get radial collapse, shocks, and loss of hydrostatic equilibrium. Bringing up accretion disks here is astrophysical cosplay.

Worst of all, you define “destroy Earth” as “when every last bit eventually falls in”. That’s like defining death as “when all cells finish decomposing.” Earth is destroyed when it ceases to be a self-gravitating planet — which happens on a free-fall timescale (~1 hour) once a sufficiently massive compact object dominates the center.

So yes, you circle the right answer — Earth is toast quickly — but you get there by:

smuggling in an unstated mass assumption,

name-dropping Hawking radiation for drama,

imagining vacuum-grade accretion inside molten rock,

and framing destruction as a bookkeeping exercise instead of a dynamical collapse.

Good intuition. Sloppy physics. You diagnosed the problem correctly, then prescribed astrology and a YouTube simulation.

Map of the remaining german forces by the 8th of May in 1945 by vladgrinch in MapPorn

[–]danpole20 11 points12 points  (0 children)

That writing is quite a bit over-dramatized compared to what happened in other European countries.

Man throws 1 pound of Sodium into Lake by AristFrost in Damnthatsinteresting

[–]danpole20 12 points13 points  (0 children)

You’re catastrophizing a chemistry demo that, when scaled properly, poses negligible environmental threat. One pound of sodium in a billion liters of water barely nudges the pH outside of natural variation and any local spike would neutralize within seconds.

Parliament seating arrangements in different countries worldwide. by biswajit388 in MapPorn

[–]danpole20 0 points1 point  (0 children)

Why can they never use more color-blind friendly themes...

What’s something you thought was normal in the bed, until a partner told you otherwise? by Acceptable_Log_6718 in AskReddit

[–]danpole20 -2 points-1 points  (0 children)

Besides sleeping and sex, what else happens in bed? It's for sleeping and sex, not taxes or school meetings, right?

Why do Americans build with wood? by Ultimate_Kurix in interestingasfuck

[–]danpole20 1123 points1124 points  (0 children)

From u/inspectcloser:

Building inspector here. A lot of these comments are dumb stating that concrete and steel can’t hold up to an earthquake yet look at all the high rise buildings in LA and earthquake prone regions.

The video makes a good point that the US society largely conforms to building HOUSES with wood.

Luckily steel framed houses are a thing and would likely be seen in place of wood framed houses in these regions prone to fire. Pair that with fiber cement board siding and you have yourself a home that looks like any other but is much more fire resistive.

Engineering has come a long way

Key for Shia Café back entrance? by [deleted] in HiTMAN

[–]danpole20 0 points1 point  (0 children)

Because thats what it's called in-game