The term "gas giant" for jupiter and similar planets always seemed a bit odd to me. Afterall they are mostly just gigantic balls of liquid for the most part and only a small outer atmosphere is gas. I mean sure the atmosphere is thicker than much smaller planets but its still made up of mostly liquid.

#astronomy #jupiter #stem @Science

@freemo @Science Griffiths was the guy who convinced me I could do physics

Interesting fact of the day: A fruit fly's sperm is many times longer than its body. In fact of all the animals it has the longest sperm relative to its body size.

#biology #science #STEM @Science

A wonderful site showing a few different types of radio signal **refraction**. Important to note what you are seeing here is totally different from the effects you get from HF radio frequencies and occurs with VHF and UHF as well. Its why generally line-of-sight frequencies like UHF can sometimes go some ways over the horizon.

dxinfocentre.com/propagation/t

#Radio #RF #Ham #HamRadio #AmateurRadio #EE #Electronics #Science #STEM @Science

This is a picture of the first moments of a nuclear explosion taken in 1952. The blast radius at this moment is less than 20 meters wide.

There are so many extraordinary things about this photo. First off the fact that they had a camera in the 1950's capable of such insanely high speed frame rates (they created a movie from this) that it was capable of 1,000,000 frames per second. In many ways that is more impressive than the nuclear bomb itself.

Second the fact that you can see, in real time, a nuclear explosion as it happens. Those spikes at the bottom are called the "rope trick effect" which is caused by the support cables inside or holding up the bomb. The light radiation is so intense it vaporizes anything nearby causing things to explode just from the intensity of the light itself (before radiation has any effect at all). So those spikes are literally just the support cables exploding in the extraordinarily bright light from the bomb.

#Science #STEM #Physics #History @Science

Interesting fact of the day: The same effect that cuased light in a prism to split up into different colors is what ultimately caused the first transatlantic telegraphic wire in 1858 to fail.

Morse code is transmitted as on-off signals, effectively square waves. Square waves are in fact made up of many different frequencies. Like in a prism different frequencies move at different speeds through a wire. Therefore as the on-off pulses traveled through the transatlantic telegraph wire the signal spread out like it does in a prism and ultimately the pulses would overlap and be indistinguishable.

The effect was so extreme that it took a message of only 98 words (the first message sent) over 67 minutes to send one way and a whopping 16 hours to confirm the message.

Whitehouse, a doctor with little mathematical understanding, thought he could solve the problem by increasing voltage, which we now know was a futile effort. He increased the voltage to the point he managed to short out the cable entirely and made it useless. However Lord Kelvin had already warned of the problem as was ignored and he came up with the law of squares to describe the problem which later was refined to give us the telegraphers equation. The telegraphers equation is still used today to model feedlines in radio transmitters and receivers.

#Science #STEM #Physics #History @Science #QOTOJournal

Anyone out there other than me old enough to have run a 10base2 network in their home? My first computers 2 computers when I was in high school I connected together with a 10base2 with 50 ohm terminators and all that. My mom wasnt happy as I literally knocked a hole in her wall without asking her.

This was back when the internet was still fairly new so you would get on with 1200 baud modems to a BBS that would give you a piggyback onto the internet which you might be lucky to get access to for 30 - 60 minutes a day.

10base2 network card attached for prosperity.

#History #Computers #CS #Engineering #ComputerEngineering #ComputerScience #Science @Science

Ya know those tiny network routers you have on your desk that you use to connect all your computers together and connect to the internet... Well this is what it looked like in the early days when the internet didnt exist as a word yet (It was still called ARPANet). Like most computer devices from the 70's it would take up a nice chunk of the room.

#History #Computers #CS #Engineering #ComputerEngineering #ComputerScience #Science @Science

A map of every node on the internet (ARPANet) in 1974, which was exactly 3 years after the network first went live.

#History #Computers #CS #Engineering #ComputerEngineering #ComputerScience #Science @Science

So a while back i realized you can create an extremely high energy hot plasma in the microwave consistently by taking a coil and streching it out and forming it into a loop with one gap on the sad. The ark that forms has huge amount of energy in a very small space. In the past it has melted a blob of borisilicate glass almost instantly fuzing the coil i to the glass under neath.

It has a tendency to grow into a large cloud of blasma that rises to the top of the microwave usually. Since this ball plasma is much larger the energy is spread out. Despite still being extremely hot its nowhere near the heat of the initial ark as it takes some time to heat glass to its melting point in this state.

So i had an idea. What would happen if i contained the arc under a pile of salt, in this case potassium salt. It should keep the plasma contained and due to maintaining a very small volume should retain the enormous heat i figured it would be more than hot enough to melt the salt but i wanted to try it out.

Attached is the video in the microwave itself. I will reply to this thread with various stills before and after of the setup showing the final results

#chemistry #physics #science #STEM @Science

"Math is never just numbers, when words fail us we use math to describe the inexpressible, the things that terrify us most: the vastness of space, the shape of time, the weight and worth of a human soul." - Foundations

#math #quote #Foundations #Science #stem #philosophy @Science

"Math is never just numbers, in the wrong hands it is a weapon, in the right hands it is deliverance" -- Foundations

#Math #Science #STEM #Philosophy @Science

This is what it looks like when you take cyanoacrylate and sone accelerator, through it in a pill capsule, shake them together and watch the reaction quickly harden. It gets so hard it starts smoking.

#science #chemistry #stem @Science

Interesting fact of the day. The very first internet connection consisting of 3 interconnected nodes was in fact WiFi... well, not wifi but radio/wireless. It was implemented as a mobile ad-hoc access point equipped in a van with the first 3-way network occurring in 1977.

#history #technology #STEM #Science @Science

Interesting fact of the day: A chimpanzee is about 1.3x to 1.5x stronger than humans when it comes to pulling, jumping, and lifting with the legs in general. However when it comes to physical strength in terms of **pushing** humans are significantly stronger than chimps. Similarly while our legs arent as strong in terms of explosive power (jumping) we are many times better at endurance (using our leg muscles for longer). A human can cover a much farther distance on foot than a chimp could.

So the general factoids about chimps being stronger then us are very misleading. They are simply adapted to be stronger at the sorts of tasks they are suited for and weaker in others, while humans are stronger than a chimp in other ways.

#Science #STEM #Biology #zoology #monkey #chimp #ape #chimpanzee @Science

Interesting thing about boolean in most languages is that it is often a trinary/tri-state variable, not a dual state true or false variable, reason being you often have nil/null you can set a boolean too as well and in many languages, particularly those where all variables are by reference, you cant change this.

Ruby is particularly interesting because it makes a distinct separation between a variable being not-set and null/nil. Therefore a boolean in Ruby is a quad-state variable that can be either not-set, nil/nill, true, or false.

NOTE: My comment about Ruby is actually misleading since its a dynamic language. If you have a variable intending to act like a boolean, strictly speaking, before you set it with a boolean variable it doesnt have a boolean type. So the boolean **type** is not quad-value. Its just any variable that the variable you intend to use exclusively for boolean can have any of 4 states, and likely does in most implementations.

#Ruby #programming @Science

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