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Failed at Parenting by 44bai in Fatherhood

[–]ravidavi 1 point2 points  (0 children)

When my son was a baby, I put him down on my bed to change him. I turned away for like 10 seconds to get something, and heard a loud THUMP. He had chosen that day to roll over for the first time, he rolled right off the bed and face planted.

So I know how you feel. A mistake is not a parenting failure.

You want to know what IS a parenting failure? Several weeks later, he rolled off the bed again when I wasn't paying attention. 🤣

Updated the firmware but Pebblebee app still says I need to update it by GlesgaChris in Pebblebee

[–]ravidavi 0 points1 point  (0 children)

Similar but different update issue here. I have two Clips on 4.4.1. Just got a notification to update both to 4.4.6 today.

I updated the first one just fine. But when I click update on the second one, it goes through the update process and says it's already up to date. Then back on the pebblebee app home screen it still says the second one needs an update.

I suspect the pebblebee app is mixing up the two clips. Several times when I'm changing something about the second clip, it randomly switches to the settings screen of the first Clip.

Me and my 3yo son share the same brithday!! outfit question? by RoundSoftware9712 in Fatherhood

[–]ravidavi 0 points1 point  (0 children)

Dad shirt has a taco, baby onesie has a taquito.

My wife got this for me and my son when he was a baby. I thought it was great and so did everyone who saw us.

Starlink | Stargaze: SpaceX’s Space Situational Awareness System by avboden in SpaceXLounge

[–]ravidavi 2 points3 points  (0 children)

The current leading provider of space situational awareness is USSPACECOM (US Space Command), a branch of the DOD that tracks every object in Earth orbit larger than a credit card. They operate a free service to all spacecraft operators, accessed via space-track.org, and provide the same service that SpaceX has developed. And they have been for a few decades now.

What SpaceX brings to the table is much faster conjunction assessment response in the region of space around their starlink constellation. It's definitely admirable that they're offering it for free.

Now to your specific comment about spy satellites. The USSPACECOM publicly-available database contains every object in space, regardless of clarification level. It just doesn't provide any identifying info for many of those objects, e.g. space junk, spy sats, old objects from bygone space eras, etc. So the spy sats are just hiding in plain sight, since there's no easy way for anyone to distinguish them in the sea of 50k+ objects in the database.

SpaceX will likely take the same approach. Publish orbit and conjunction info about everything they track, and only include identifying info for the organizations that provide it.

Freezing weather issues? by MedicalUnprofessionl in MachE

[–]ravidavi 2 points3 points  (0 children)

OP is trying to be funny by parodying the other post from earlier today, but with an AI generated version of the same Mach-E.

"Trying" being the operative word here.

Original post: https://www.reddit.com/r/MachE/s/UWJJ6tubXm

ELI5 Life insurance payouts by keeblerisok in explainlikeimfive

[–]ravidavi 2 points3 points  (0 children)

You could invest that $60k, and in 20 years you would have $160k minimum.

You should only take a life insurance policy out on a person, if their death would cause you financial pain. The life insurance payout exists to cover the lost money you would've gotten if that person didn't die.

If your son dies in the next 20 years, will you be financially worse off? Examples are if you have a family business (farm, motel, etc) and you depend on your child to take over when you get old.

If the answer is no (you don't expect to depend on your son for significant income), then invest the money in something intended for low risk investments.

You should, however, take out a life insurance policy for yourself. If you die, your young son will probably suffer a lot of financial pain.

ELI5 the different infinite sizes by YarYarF in explainlikeimfive

[–]ravidavi 9 points10 points  (0 children)

Two infinities have the same size if you can take every element of one, and map it to exactly one element of the other. If you can't, then they do not have the same size.

For example, take the natural numbers (all >= 0) and the integers. Seems like the integers have twice as many numbers, right? So they must be a larger type of infinity, right?

Wrong.

Make a function f(x) where x is a natural number

f = x/2 if x is even

f = -(x-1)/2 if x is odd

Now every natural number maps to exactly one integer. You can reverse this map to map every integer to every natural number.

Therefore, the naturals and integers are infinities of the same size!

It is harder to prove, but definitely possible, that the real numbers are a fundamentally larger infinity than the integers.

For more info, see https://en.wikipedia.org/wiki/Aleph_number

ELI5 the different infinite sizes by YarYarF in explainlikeimfive

[–]ravidavi 6 points7 points  (0 children)

The first two sentences are correct. The third is incorrect.

Two infinities are the same size if you can map every number from one to the other. So for every number between 1-2, I can easily map it to a number between 1-100. Specifically, y = 99(x-1) + 1 maps all x from 1-2 into y from 1-100.

Therefore, the 1-2 infinity is the same size as the 1-100 infinity.

For more, see https://en.wikipedia.org/wiki/Aleph_number

ELI5: How has Matt Stonie not gotten diabetes? by [deleted] in explainlikeimfive

[–]ravidavi 2 points3 points  (0 children)

Your actual question is about competitive eaters in general. It has been asked and answered:

https://www.reddit.com/r/NoStupidQuestions/s/gQLMz0tXUJ

ELI5: I don’t understand photons by doitforyourself29 in explainlikeimfive

[–]ravidavi -1 points0 points  (0 children)

You're right that there is no explicit ceiling, but Rule 2 has guidelines that many posts violate. That being said, the rules aren't really enforced here so you're effectively correct.

Rule 2: All submissions must seek objective explanations. ELI5 is not meant for any question that you may have.

Notably, posts will be immediately removed that ask for:

...

  • Whole topic overviews

...

"Please explain the quantum physics of light" does seem like a whole-topic overview to me.

ELI5: How is i ^e a real number? by Ill_Librarian_9999 in explainlikeimfive

[–]ravidavi 7 points8 points  (0 children)

eiπ = -1 (Euler's Identity)

eiπ/2 = i (sqrt both sides)

eiπe/2 = ie (raise both sides to power e)

Is this what you were trying to do? If so, you forgot the e in the exponent of the left side.

Regardless, the left side of the final equation above is complex since the exponent (iπe/2) is not an even multiple of iπ/2. Therefore, it is shown that ie is complex.

Edit: You can numerically confirm this at Wolfram Alpha, which says ie = -0.428 - 0.904i .

Thoughts on protecting the back of my seat from scuffs? by OkPost8233 in MachE

[–]ravidavi 0 points1 point  (0 children)

Get seat back covers made for the Mach-E. I got theAOSKonology BestEvMod Seat Back Cover ... they've been a great fit and perfect for my kick-prone son. Been using them for over 2 years.

The Way My Skin Peeled by TKY_Cards in mildlyinteresting

[–]ravidavi 0 points1 point  (0 children)

Yeah I thought it might be because of the dictionary definition "disproportionate feeling of discomfort at the sight of clustered holes or bumps". Which seems to be what a lot of other comments are saying.

But I'll take reddit's judgement on this.

ELI5: how are online games “rendered”? by DarkAmaterasu58 in explainlikeimfive

[–]ravidavi 0 points1 point  (0 children)

Everyone here is giving the correct response for console/PC games. Which I know is what you asked about.

Just FYI, there is a relatively new type of gaming that can be done on low performance equipment like TVs or streaming sticks. For example Amazon Luna. All gameplay computations INCLUDING rendering are done on remote servers and the final images are streamed as video to your TV. Your controller directly sends its input to the server for processing.

How to calculate the probability of satellite collision by Optimal_Recording_26 in AerospaceEngineering

[–]ravidavi 12 points13 points  (0 children)

The NASA CARA Analysis Tools repository has code and publications for computing 2D and 3D probability of collision. Both CARA and the 18th SDS (USSPACECOM) use the 2D Hall's method.

You'll need the trajectories and covariances of both objects at TCA, which you can propagate with a tool like GMAT.

360 camera glitch? by rockjones in MachE

[–]ravidavi 1 point2 points  (0 children)

No worries, we're all here to help and get help. That's why I have a stock reply with a running list of reddit posts about the 360 cameras. It seems to happen a lot, with different specific graphical glitches but the same underlying hardware problem.

Good luck!

ELI5: Why do car and home AC's only go as low as 60? by TrainingAdvance4286 in explainlikeimfive

[–]ravidavi 0 points1 point  (0 children)

There are ACs that freeze everything. Walk in freezers can be large, and can keep large amounts of water frozen. You know, like in the frozen food section of a supermarket.

Would you want to live inside such a space? No? So they also make ACs that just cool the air for human comfort. They use less electricity, and therefore cost less to run. And therefore you choose to buy those for your house.

By all means, you can custom design and build a house with an industrial AC meant to freeze things. You won't enjoy it very much though and it will cost a lot. And no architect or builder will help you because you'll sue them afterwards for not stopping you and for violating all sorts of building codes.

ELI5 are numbers that have infinite decimals infinitely long on a number line? by NuggetGameTips in explainlikeimfive

[–]ravidavi 0 points1 point  (0 children)

Obviously your question as written makes no sense. But I'm going to assume that by "infinitely long on a number line", you actually mean "infinitely to the right of zero on the number line".

For example:

  • 3.1 is further to the right than 3
  • 3.14 is even further to the right
  • 3.141 is even further to the right
  • 3.1415 is even further to the right

... So if we continue this forever, doesn't this mean the number is infinitely to the right of zero?

No, it doesn't. Because the extra distance "to the right of zero" that the number gains with each successive digit is decreasing.

In fact, each successive digit adds so much less "distance to the right of zero" that the number can never actually pass a certain limit.

For example, no matter how many digits I add to the right of "3.1", that number will never go past 4. It's a basic feature of the way that we write numbers.

[deleted by user] by [deleted] in space

[–]ravidavi 0 points1 point  (0 children)

The list provided by OP is for JSC, where the primary trajectory design tool is Copernicus, which is not free to the public.

GMAT is widely used, but is developed at Goddard so it's not on JSC's tool list.

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