Entrepreneurship at the University of Cambridge Updated 2025-07-16
Larmor precession Updated 2025-07-16
MongoDB Updated 2025-07-16
List databases:
echo 'show dbs' | mongoShow all data from one of the collections: stackoverflow.com/questions/24985684/mongodb-show-all-contents-from-all-collections
echo 'db.collectionName.find()' | mongo mydb Cell biology (field) Updated 2025-07-16
Cell culture Updated 2025-07-16
Cell-free protein synthesis Updated 2025-07-16
Cell projection Updated 2025-07-16
Central Intelligence Agency Updated 2025-07-16
Euro Updated 2025-07-16
The Euro Has Never Been More Problematic by Yanis Varoufakis (2018)
Source. Talk given at the Oxford Union. youtu.be/cCA68U3P_Z8?t=1288 describes the problem with the Uero a bit better. Satoshi tribute Updated 2025-07-16
- medium.com/@chain.info1/the-mystery-behind-satoshi-tribute-donations-cf4ce28c56a1 The Mystery Behind "Satoshi Tribute" Donations by Chain.Info (2020)
Self-driving car Updated 2025-10-14
X-ray diffraction Updated 2025-07-16
Often used as a synonym for X-ray crystallography, or to refer more specifically to the diffraction part of the experiment (exluding therefore sample preparation and data processing).
Evil demon Updated 2025-07-16
Fluorescent lamp Updated 2025-07-16
Genesis block message Updated 2025-07-16
Inscription added by Satoshi Nakamoto on the Genesis block containing:which is a reference to: www.thetimes.co.uk/article/chancellor-alistair-darling-on-brink-of-second-bailout-for-banks-n9l382mn62h wihch is fully titled:The "Alistair" was slikely removed due to limited payload concerns.
And it hints that one of Bitcoin's motivation was the financial crisis of 2007-2008, where banks were given bailouts by the government to not go under, which many people opposed as the crisis was their own fault in the first place. A notable related stab is taken at Len Sassaman tribute.
We can extract the image from the blockchain ourselves by starting from: blockchain.info/block-height/0?format=json.
From that page we manually extract the hash and that does contain the famous genesis block string:The JSON clarifies that the data is encoded in the
000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f and then:wget -O 0.hex https://blockchain.info/block/000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f?format=hex
xxd -p -r 0.hexEThe Times 03/Jan/2009 Chancellor on brink of second bailout for banksscript field of the transaction input:{
{
"script":"04ffff001d0104455468652054696d65732030332f4a616e2f32303039204368616e63656c6c6f72206f6e206272696e6b206f66207365636f6e64206261696c6f757420666f722062616e6b73"The extra where:
E (0x45 in ASCII) in EThe Times is just extra noise required by the script, we can break things up as:04ffff001d0104 45 5468652054696d65732030332f4a616e2f32303039204368616e63656c6c6f72206f6e206272696e6b206f66207365636f6e64206261696c6f757420666f722062616e6b7354isT- the
04ffff001d0104part just doesn't show up on the terminal because it is not made of any printable characters.
The initial
04 is OP_RETURN.TODO what is actual the meaning of the
ffff001d010445 part? @defango twitter.com/defango/status/1642750851134652417 comments:04ffff001d0104 is a hexadecimal string. It is commonly used in the Bitcoin network as a part of the mining process. Specifically, it is used as the target value for a block to be considered valid by the Bitcoin network.
Neon lamp Updated 2025-07-16
The best science fiction works deeply explore the consequences of one single technology Updated 2025-07-16
The impact of the work is greater when you examine what one single new technology would do to existing society, as in Primer (2004), rather than "start on a society with severl new technologies", like in Star Wars.
There is value in tutorials written by beginners Updated 2025-07-16
Ciro Santilli is a big believer that there is value in tutorials written by beginners, because beginners are more likely to explain things in a way that other beginners can understand.
Even though they make more mistakes, this more approachable point of view can be very valuable.
And mistakes/omissions can be corrected on comments by people with more knowledge, so that the writer also ends up learning something new.
By other people:
- jakobschwichtenberg.com/about/ from Jakob Schwichtenberg mentions quotes C. S. Lewis book "Reflections on the Psalms"[ref]:
It often happens that two schoolboys can solve difficulties in their work for one another better than the master can. [...] The fellow-pupil can help more than the master because he knows less. The difficulty we want him to explain is one he has recently met. The expert met it so long ago he has forgotten. He sees the whole subject, by now, in a different light that he cannot conceive what is really troubling the pupil; he sees a dozen other difficulties which ought to be troubling him but aren't.
Thermodynamic potential Updated 2025-07-16
chemistry.stackexchange.com/questions/7696/how-do-i-distinguish-between-internal-energy-and-enthalpy/7700#7700 has a good insight:
To summarize, internal energy and enthalpy are used to estimate the thermodynamic potential of the system. There are other such estimates, like the Gibbs free energy G. Which one you choose is determined by the conditions and how easy it is to determine pressure and volume changes.
Helmholtz equation Updated 2025-07-16
eigenvalue problem of Laplace's equation.
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