🎓 Doc Freemo 🇳🇱 @freemo@qoto.org

Ham radio operators be like...

#Science #Ham #HamRadio #amateurradio #radio #rf #EE #Electronics @Science

Could you imagine going back in time and telling Newton that we put a man on the moon. Then after all his excitement just going "Yea but that was before I was even born, we are way more advanced than that by the time I was born and grew up!"

@Science #science #physics #astronomy

@funny

Finally Quantum Mechanics explained.

#funny #Humor #Humour #joke #jokes #meme #physics #science @Science

@funny

Sagan's whole approach to aliens summed up perfectly

#Funny #humour #humor #joke #jokes #meme #science #astronomy #space #aliens @Science

@Science

Please know your philosophical razors if you dont already!

(taken from wikipedia):

* Occam's razor: Simpler explanations are more likely to be correct; avoid unnecessary or improbable assumptions.

* Hanlon's razor: Never attribute to malice that which can be adequately explained by stupidity.

* Hitchens's razor: "What can be asserted without evidence can be dismissed without evidence."

* Hume's guillotine: What ought to be cannot be deduced from what is. "If the cause, assigned for any effect, be not sufficient to produce it, we must either reject that cause, or add to it such qualities as will give it a just proportion to the effect."

* Newton's flaming laser sword: If something cannot be settled by experiment or observation, then it is not worthy of debate.

* Sagan standard: Extraordinary claims require extraordinary evidence.

* Popper's falsifiability principle: For a theory to be considered scientific, it must be falsifiable.

* Grice's razor: As a principle of parsimony[disambiguation needed], conversational implications are to be preferred over semantic context for linguistic explanations.

#science #philosophy #Logic

@Science

Interesting fact of the day: Assuming you live around sea level, and weigh about 140 lbs then if you were to weigh yourself in a perfect vacuum you would weigh about 1/5th (0.2) lbs heavier.

#science #physics

@math

A new post I wrote explaining how to write an efficient Exponential Moving average with a finite length.

https://jeffreyfreeman.me/an-efficient-exponential-moving-average-of-finite-length/

#science #math #maths #mathematics #programming #DSP @Science

@math

Early rough draft, haven't proof read it yet. But just wanted to share the math behind creating an efficient Exponential Moving Average with a finite length/cut off. I found this was needed for a project I am working on where the EMA much be determined by random access to various points in a time series and couldn't be calculated for the entire time series in one go.

I needed to modify the EMA for a finite back-length. The standard EMA is only really efficient when calculated sequentially for the entire time series. This implementation is an efficient design that allows for calculation at a point by using finite back-length.

This is an early draft, did not proof read it yet, just whipped it together, though pretty sure the math is close to the final form. I will publish it sometime tomorrow but want to share what I have and welcome and questions or feedback before I publish it.

https://beta.jeffreyfreeman.me/an-efficient-exponential-moving-average-of-finite-length/

#Programming #Math #Maths #Mathematics #algorithms #Science #QOTOJournal

Interesting fact of the day:

Islamic medicine was well ahead of its time when it came to the treatment of the mentally ill. the Quran demanded the those with mental illness be taken care of and treated kindly, this was reflected in how doctors of the time cared for the mentally ill and very much a departure from the attitudes of other cultures at the time where the mentally ill were demonized or quite literally treated as possessed.

Here is the specific quote from the quran translated to english:

"Do not give your property which God assigned you to manage to the insane: but feed and clothe the insane with this property and tell splendid words to them." -- Sura 4:5

#History #Islam #Musslim #Quran #Religion #Psychology #medicin #history #science @Science

Yup the whole "white people were the oppressors throughout history" nonsense is getting old, and not at all in line with history...

#history #science

@math

A wonderful visualization of the often unknown Quaternions (a generalization of complex numbers into 4 dimensions).

https://youtu.be/d4EgbgTm0Bg

#Math #Mathematics #Science

@Science

How the Zodiac Cypher was finally solved after over 50 years:

https://www.youtube.com/watch?v=-1oQLPRE21o

#Cipher #cryptography #SerialKiller #Science #Math

@Science

For a while now i've had this nagging need to produce a small scale device capable of producing and demonstrating Shock Diamonds. No interest in efficiency or using it for propulsion or anything. I really just want people to be able to see shock diamonds up close and safely.

#Science #Physics #Aerospace

@Science

Philosopher: "For all your science your beleifs are no better than a flat disc on the back of elephants resting on a turtle's back"

Astronomer: "Even without science that makes no sense, what is the turtle resting on top of!"

Philosopher: "Another turtle, its turtles all the way down!"

Astronomer: "See, that is just absurd, how could anyone believe that!"

Philosopher: "What does your science say keeps the earth and the moon fixed to each other?"

Astronomer: "Gravity, the moon orbits around the earth, or rather, the center of mass between the earth and the moon, its just an orbit"

Philosopher: "Then what does your earth orbit?"

Astronomer: "The center of the solar system."

Philosopher: "And the solar system?"

Astronomer: "The center of the galaxy!"

Philosopher: "And where does it end, what is at the end of this logic"

Astronomer with a defeated look on his face: "Its orbits, just orbits... It.. is... orbits, all the way down."

::Philosopher smiles::

#Science #Physics #Space #TurtlesAllTheWayDown #Philosophy

@Science

So seems the latest wave of stupid on the internet is to claim that the deaths in 2020 were no more than in 2018, 2019 or other past years, which apparently means the coronavirus is a hoax or some such nonsense.

Nevermind the fact that there isn't an iota of truth anywhere in that nonsense. The number of deaths in 2020 is significantly higher than past years. In fact even though we only have data up to the beginning of december and 2 weeks of that is incomplete/delayed.. therefore we have about 6 weeks of data yet to be finalized. Despite that we are hundreds of thousands more deaths ahead of 2019 and 2018, by about 300,000 more so far. Hell the death rate is increased even if you **dont count** COVID by more than 1.2%...

Here is a crazy idea, instead of getting your knowledge base from random internet memes how about trying some research from time to time maybe? It isnt like its hard to find the real numbers.

#Science #Health #COVID #COVID19 #Corona #Coronavirus #CDC

@Science

So here is a question some of my EE and radio friends disagree on... Is a purely resistive matched load, like a 50 ohm dummy load, considered "resonant". In the strictest sense of the word is that a valid term here?

While it would seem odd I'm leaning towards yes, and would be the simplest example of resonance.

#EE #Electronics #Ham #HamRadio #amateurradio #adio #rf #science #physics

@Science

Know then thyself, presume not God to scan,
The proper study of mankind is man.
Plac'd on this isthmus of a middle state,
A being darkly wise, and rudely great:
With too much knowledge for the sceptic side,
With too much weakness for the Stoic's pride,
He hangs between; in doubt to act, or rest;
In doubt to deem himself a God, or beast;
In doubt his mind or body to prefer;
Born but to die, and reas'ning but to err;
Alike in ignorance, his reason such,
Whether he thinks too little or too much:
Chaos of thought and passion, all confus'd;
Still by himself abus'd or disabus'd;
Created half to rise, and half to fall;
Great lord of all things, yet a prey to all;
Sole judge of truth, in endless error hurl'd:
The glory, jest, and riddle of the world!

Go, wondrous creature! mount where science guides,
Go, measure earth, weigh air, and state the tides;
Instruct the planets in what orbs to run,
Correct old time, and regulate the sun;
Go, soar with Plato to th' empyreal sphere,
To the first good, first perfect, and first fair;
Or tread the mazy round his follow'rs trod
And quitting sense call imitating God;
As eastern priests in giddy circles run,
And turn their heads to imitate the sun.
Go, teach eternal wisdom how to rule-
Then drop into thyself, and be a fool!

Superior beings, when of late they saw
A mortal man unfold all nature's law,
Admir'd such wisdom in an earthly shape,
And shew'd a Newton as we shew an ape.

Could he, whose rules the rapid comet bind,
Describe or fix one movement of his mind?
Who saw its fires here rise, and there descend,
Explain his own beginning, or his end;
Alas what wonder! man's superior part
Uncheck'd may rise, and climb from art to art;
But when his own great work is but begun,
What reason weaves, by passion is undone.

Trace science then, with modesty thy guide;
First strip off all her equipage of pride;
Deduct what is but vanity or dress,
Or learning's luxury, or idleness;
Or tricks to shew the stretch of human brain,
Mere curious pleasure, or ingenious pain;
Expunge the whole, or lop th' excrescent parts
Of all our vices have created arts;
Then see how little the remaining sum,
Which serv'd the past, and must the times to come!

Alexander Pope, An Essay on Man, Epistle 2:

#Literature #English #Quote #Quotes #Poetry #Poem #AlexanderPope #Science #Sciences

@Science

Man this is why people have to learn you cant oversimply your beleifs, if you do its little more than dogma.

1% dead is a lot, its a hell of a alot. Imagine if every time you flew somewhere 3 - 4 people died on the plane (1%), I bet you might think twice before taking that plane...

#COVID #COVID19 #Science #Medicine #medical #Corona #Coronavirus

@funny

My valuable contribution to twitter today.

The Eagles are Philadelphia's football team by the way.

#Eagles #Football #Twitter #funny #Humour #Humor #Joke #Jokes #Science #ScienceJoke

@math

In case anyone is curious as to how to do some elementary statistics, in this case combinatorics, here is a quick little write up I did to explain the "n choose k" paradigm.

Here is the is the question (from my cousin):

> Math people
Can you help me ??
Let's say
Hypothetically
You have 7 numbers
Between 1-99
The first 6 cant repeat but the 7th can
How many outcomes are possible?
This isnt a riddle or anything I just dont know how to do the math on something I'm trying to figure out

Here is my answer:

http://mathb.in/47715

#Statistics #Math #mathematics #Stats #Science #Learning