Archive example: web.archive.org/web/20130726224338/http://librarianhelper.com/
The mandatory xkcd: xkcd 927: Standards.
Some interesting analysis by Parth Shukla twitter.com/pparth | www.linkedin.com/in/parth-shukla-59583b20/:
Apparently most of the routers were Chinese. No surprise there.
Experiments to measure it:
The 2019 redefinition of the SI base units defines it precisely and uses it as a measure of charge: en.wikipedia.org/wiki/2019_redefinition_of_the_SI_base_units#Ampere
hello_world.asm
section .data
hello_world db "Hello world!", 10
hello_world_len equ $ - hello_world
section .text
global _start
_start:
mov rax, 1
mov rdi, 1
mov rsi, hello_world
mov rdx, hello_world_len
syscall
mov rax, 60
mov rdi, 0
syscallCompiled with:
nasm -w+all -f elf64 -o 'hello_world.o' 'hello_world.asm'
ld -o 'hello_world.out' 'hello_world.o' There are no known eukaryotes which never had mitochondria Updated 2025-06-17 +Created 1970-01-01
As of 2020, there are no known eukaryotes which have never had mitochondria.
Known eukaryotes without mitochondria, which are very rare, have lost mitochondria they previously had.
Having mitochondria appears to be a requisite for being an eukaryote. This is one of the central thesis of Power, Sex, Suicide by Nick Lane (2006).
An ELF file contains the following parts:
- ELF header. Points to the position of the section header table and the program header table.
- Section header table (optional on executable). Each has
e_shnumsection headers, each pointing to the position of a section. - N sections, with
N <= e_shnum(optional on executable) - Program header table (only on executable). Each has
e_phnumprogram headers, each pointing to the position of a segment. - N segments, with
N <= e_phnum(only on executable)
The order of those parts is not fixed: the only fixed thing is the ELF header that must be the first thing on the file: Generic docs say:
In pictures: sample object file with three sections:
+-------------------+
| ELF header |---+
+---------> +-------------------+ | e_shoff
| | |<--+
| Section | Section header 0 |
| | |---+ sh_offset
| Header +-------------------+ |
| | Section header 1 |---|--+ sh_offset
| Table +-------------------+ | |
| | Section header 2 |---|--|--+
+---------> +-------------------+ | | |
| Section 0 |<--+ | |
+-------------------+ | | sh_offset
| Section 1 |<-----+ |
+-------------------+ |
| Section 2 |<--------+
+-------------------+But nothing (except sanity) prevents the following topology:
+-------------------+
| ELF header |---+ e_shoff
+-------------------+ |
| Section 1 |<--|--+
+---------> +-------------------+ | |
| | |<--+ | sh_offset
| Section | Section header 0 | |
| | |------|---------+
| Header +-------------------+ | |
| | Section header 1 |------+ |
| Table +-------------------+ |
| | Section header 2 |---+ | sh_offset
+---------> +-------------------+ | sh_offset |
| Section 2 |<--+ |
+-------------------+ |
| Section 0 |<---------------+
+-------------------+But some newbies may prefer PNGs :-)
- section: exists before linking, in object files.Major information sections contain for the linker: is this section:
- segment: exists after linking, in the executable file.Contains information about how each segment should be loaded into memory by the OS, notably location and permissions.
When non-specialists say "Ethernet cable", they usually mean twisted pair for Ethernet over twisted pair.
But of course, this term is much more generic to a more specialized person, since notably fiber optics are also extensively used in Ethernet over fiber.
General Embryology review in 20 minutes by Medical Animations (2020)
Source. Completely devoid of passion, but once you already have the I should have loved biology by James Somers mindset, it's OK.There is also a time-energy uncertainty principle, because those two operators are also complementary.
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