Following Incident 2123-2007, SCP-2123 will undergo an Excursion 
Event at an average rate of once every two weeks. During these 
events, collision energies and emitted level of radiation increase 
between 10 and 100 times normal levels. When collision energies 
exceed approximately 5.3PeV,[REDACTED; SEE ADDENDUM 
2123-ALPHA (LEVEL 4 CLEARANCE REQUIRED)]. The median 
duration of Excursion Events is approximately 30 seconds, with the 
longest observed event lasting 127 seconds. 


Personnel with adequate clearance may consult Addendum 2123- 
Alpha for further information regarding SCP-2123's Keter 
classification. 


Discovery: According to information from the Occupational Safety 


and Health Administration's regional office in Dallas, SCP-2123 was 
constructed between 2001 and 2003 by an organization known as 
Fiz-Hex Inc. (FHI). OSHA ordered FHI to suspend operations at 
Site-2123 on September 27, 2003, due to higher than acceptable 
levels of radiation being released by the device into work areas. On 
December 24, three OSHA inspectors received fatal radiation doses 
from exposure to SCP-2123 when they visited the facility to oversee 
the restart of the accelerator. Although SCP-2123 was in operation, 
the facility was entirely deserted at the time. 


Following this incident, the Foundation took custody of Site-2123. 
Investigation of Site-2123 found all physical and digital 
documentation to be completely blank. Site-2123 was secured, and 
standard information management protocols were enacted. A 
containment enclosure around SCP-2123 was completed on March 
2, 2004. The whereabouts, identities, and number of FHI's 
employees are unknown. 


Addendum: Incident 2123-2007 


Between April 8 and August 27, 2007, a series of experiments 
designated Study 2123-245 were performed. Data gathered from 
this study resulted in SCP-2123 being upgraded from Euclid to Keter 
on 1/15/2008. 


The following is a series of emails exchanged between several 
researchers involved. Access to the full results of Study 2123-245 
requires Level 4 clearance. 


Level 3-2123 Clearance Required 


FROM: 

TO: Site Director Douglas 

CC: Dr. Dominick Jensen 

SUBJECT: Experimental Proposal for 
SCP-2123 


FROM: Site Director Douglas 

TO: 

CC: Dr. Dominick Jensen 

SUBJECT: Re: Experimental Proposal for 


SCP-2123 


Your primary proposal, 2123-245a "Study of 
High Energy Meson Decays within SCP-2123", 
has been granted temporary approval for 60 
days. Please report your findings to to Dr. 
Jensen within that time. 


Your secondary proposal, 2123-245b 
"Experiments at Energies Exceeding 1PeV", 
has been placed on hold, pending results of 
your primary study. Approval may be granted 
later. 


| look forward to your results. 


FROM: Dr. Dominick Jensen 

TO: Site Director Site Director Douglas 
SUBJECT: Proposal 2123-245 
ATTATCHMENTS: 2123-245a_ Data. ; 
2123-245b.doc 


Dr. 's tests have produced several 
intriguing results. 


Firstly, study of neutral kaons produced within 
SCP-2123 has shown them to consist entirely 
of K9, with K° being absent. No oscillation has 
been observed. 


Second, studies of the paths of particles have 
shown charged kaons, D-mesons, and B- 
mesons, to "clump" together with similarly 
charged particles. The exact force causing this 
is not clear. However, increasing energies by 
1TeV allows these "Clumps" to exist for up to 
10-19s longer. 


It is of my own and Dr. _ 's opinion that study 
of the force binding these mesons may be 
easier to study at higher energies. Current 


models predict that SCP-2123's maximum 
output is approximately 50PeV. Therefore, 
collision energies of at least 1-5PeV, as we 
believe are necessary to study this 
phenomenon, are possible. 


Attached to this email are the complete results 
of Study 2123-245a, as well as a revised 
proposal for 2123-245b, courtesy of Dr. 

We patiently await your response. 


FROM: Dr. 

TO: Site Director Douglas 
CC: Dr. Dominick Jensen 
SUBJECT: Study 2123-245b 


FROM: Site Director Douglas 
TO: Dr. 

CC: Dr. Dominick Jensen 
SUBJECT: Re: Study 2123-245b 


SCP-2123 is currently undergoing testing to 
ensure power increases will not have any 
detrimental effects on containment. Study 
2123-245b is on hold, pending the results of 
this test. 


FROM: Site Director Douglas 
TO: Dr. 

CC: Dr. Dominick Jensen 
SUBJECT: Re: Study 2123-245b 


As testing has revealed no dangers besides 
increased emission of radiation, permission to 
operate SCP-2123 at energies of 5PeV ona 
biweekly basis has been granted for 180 days, 
beginning on 4/8. Permanent approval is 
pending. 


FROM: Dr. Thomas H 
TO: Dr. Dominick Jensen 


SUBJECT: Unusual Results of Mesonic 
Oscillation Tests 


Over the past month, | have been using a non- 
anomalous linear particle accelerator to 
attempt to replicate Dr. _—'s results in Study 
2123-245b. At this time, | have been unable to 
replicate meson "clumping" that was observed 
in his experiment. However, a more unusual 
result has been observed. 


Observation of kaon, B-meson, and D-meson 
oscillation has shown unusual patterns in the 
ratio of particles to antiparticles. During initial 
testing, the ratios were exactly reversed of 
what was expected, with concentrations of K®, 
BO, ,and D9 being up to 5% greater than their 
corresponding particles. Repeated testing 
confirmed this result. 


On / , two weeks after testing commenced, 
concentrations of K9, B°, and D® returned to 
normal levels and remained so for the 
following two weeks. Ratio of particles to 
antiparticles continue to reverse ata 
consistent rate of once every 2 weeks. It 
should be noted that this directly correlates 
with the timing of the current tests being 
conducted with SCP-2123. 


| have spoken in person with Dr. and 
presented my concerns. He has referred me 
back to you. | request that testing on 
SCP-2123 be halted immediately until the full 
implications of this phenomenon are fully 
addressed. 


TO: Dr. , Site Director Douglas 
FROM: Dr. Dominick Jensen 
SUBJECT: Termination of Study 2123-245 


SCP-241: Good Home Cooking 


Item #: SCP-241 
Object Class: Safe 


Special Containment Procedures: SCP-241 is to be kept at 
Site-19 using standard operating procedures for containing Safe- 
class book- and manuscript-typoe SCPs (see Document 241-05-3H), 
with the following additional conditions: SCP-241 must be kept open 
on a flat surface, with restraints across opposing pages of the open 
book to keep it from closing accidentally. Containment devices must 
be checked at least once a week for structural integrity. Any 
anomalies must be reported immediately to Site Command. 


Access to SCP-241 is restricted. Any and all usage of SCP-241 
must be logged. SCP-241 must be transported in an authorized 
bookstand such that it cannot accidentally be closed in transit. 


In the event that SCP-241 is opened outside of a testing 
environment, the last person to have touched it must report to the 
nearest infirmary, and a D-class personnel must close and re-open 
SCP-241. 


Description: SCP-241 appears as a normal book, 33 cm x 23 cm x 
3.5 cm, entitled Good Home Cooking. The cover of SCP-241 is a 
red and white checkerboard pattern, with the title in simple black 
letters on the front and spine. When open, SCP-241 contains 99 
recipes, sorted into typical sections of a cookbook. Many of these 
recipes include a picture of the dish that is invariably appetizing, and 
a small percentage will call for rare or exotic ingredients. 


Whenever SCP-241 is opened by a subject (known as the Target) 
different from the one who last opened it (i.e. the previous Target), 
the recipes contained in the book change. Preliminary investigations 
concluded that if the Target eats a dish prepared from one of the 
recipes in SCP-241, that person soon dies from apparent 


At this time, | am ordering an immediate stop 

to Study 2123-245 due to the unacceptable 

risk of [REDACTED] indicated by several 

experiments conducted on site, and at Sites , 
, and 


| request an emergency containment meeting 
be held within the next 72 hours. Further 
concerns will be addressed at that time. 


Addendum 2123-Alpha 
The following document is classified Level 4-2123 clearance. 


All personnel receiving Level 4-2123 clearance are to be briefed 
using the following document. 


Level 4-2123 Clearance Required 
First of all, let me congratulate you on the promotion. 


Now, | know you're curious about what's behind those 
redacted brackets. If you weren't, then you wouldn't be 
reading this. You’ve been looking through SCP-2123’s 
documentation, trying to find any piece of information 
that could provide answers. There are a few nuggets of 
information that were intentionally left in the database, 
which we have watched you synthesize together over 
your time on this project. Maybe it’s been a month, 
maybe a year. 


But here we are. You found enough to come to your 
current conclusion, consciously or otherwise. You're 
sitting down in a private room and reading this text. Now 
is the time for answers. 


Yes, your conclusion was correct. Once again, if it 
wasn't, you wouldn't be reading this. So let’s remove all 
doubt from this. 


SCP-2123 Excursion Events cause CP-Inversion on a 


massive, possibly infinite scale. Our universe is 
converted from matter to antimatter, and vice versa, ona 
biweekly basis. 


Of course, we’re still here. The Earth continues around 
the sun as the sun circles our galaxy. Our multitude of 
objects stays in containment. Indeed, the change is 
subtle. 


But we know that the implications of this are, at best, 
rather unfortunate. Since our universe popped into 
existence, matter and antimatter were never perfect 
opposites. Matter was a small bit more stable, and a 
small bit more of it was produced, due to the 
phenomenon that you know as CP-Violation. It is 
because of this imperfect balance why anything exists in 
our universe at all. It is because of this asymmetry why 
we can notice the inversions caused by Excursion 
Events. It is this effect that now undermines the stability 
of every single object in creation. 


We estimate that at least . Yg of material have been 
annihilated thus far by excursion events. This, on its 
own, constitutes a YK-Class Restructuring scenario 
every two weeks. 


By receiving 4-2123 Clearance, you are being 
reassigned to research ways to stop Excursion Events. 
All data related to current testing is now available for you 
to read. Please keep all proposals focused on 
containment. Trying to use this thing to study our 
universe has done nothing but put everything at a great 
risk. 


-Site-2123 Director Douglas 
Addendum: Incident 2123-2008-3 
Level 5-2123 Clearance Required 


Following Incident 2123-2007, Dr. James Leary, the 


head researcher on Study 2123-245, was reassigned as 
consultant on SCP-2123. 


On March 8, 2008, SCP-2123 underwent a predicted 
Excursion Event at 1343 CST, which lasted 103 
seconds. Dr. Leary was assisting researchers testing 
new containment strategies at the time. Personnel 
observed Dr. Leary collapse and begin to vomit profusely 
upon the end of the Excursion Event. Dr Leary was 
transferred to Site-2123’s infirmary and found to be 
displaying symptoms consistent with an extremely high 
dose of ionizing radiation. Despite treatment, he expired 
12 hours later. 


2 minutes following his death, Dr. Leary’s body began to 
emit high levels of gamma radiation, resulting in minor 
damage to the medical ward, and 3 medical personnel 
receiving non-fatal doses. High levels of radiation 
continued to be emitted, before subsiding over the 
course of the next hour. No trace of Dr. Leary's body was 
found. 


Over the next three days, multiple personnel reported 
problems with the files regarding Incident 2123-2007. 
Examination found that all entries written by Dr. Leary, 
as well as all mentions of his name, had been blanked. 
Further investigation found this anomaly to also be 
affecting Dr. Leary’s Personnel File, and all other entries 
authored by him. 


Following this incident, other researchers have died 
under similar circumstances. The average distance 
between victims and SCP-2123 has increased by %. 


« SCP-2122 | SCP-2123 | SCP-2124 » 


SCP-2124: Conceptual Knife 


Item #: SCP-2124 
Object Class: Safe (pending review following test 2124-09) 


Special Containment Procedures: SCP-2124 should be kept in a 
secure storage locker, sized at least 50cm by 50cm by 10cm. This 
locker should be kept sterile, free of moisture and airtight whenever 
practicable in order to prevent SCP-2124 from deteriorating. 


A foam insert molded to fit a 20cm-length brand kitchen knife 
has been added to the inside of SCP-2124 following test 2124-04 
and, while removable, should be kept in place during approved tests 
pending approval from a senior researcher or other staff member of 
level-3 clearance or above. Any instances of SCP-2124-1 must be 
returned to the box, ideally to the molded insert, during standard 
storage. 


Testing of SCP-2124 is permitted by staff of level-2 clearance and 
above after filing of form F-2124-01. Following test 2124-09, testing 
of SCP-2124 is forbidden unless directly supervised by a staff 
member of level-4 clearance or above. 


Description: SCP-2124 is a large-sized pizza box, made out of 
double-layered brown cardboard. SCP-2124 contains grease- 
residue and upon initial discovery showed early signs of 

mold growth (removed upon standard sterilization procedure), but is 
otherwise in good condition for its age. Written in black ink, 
presumably by a black felt-tip-pen, upon the top of the box is the 
message 'CAREFUL! INVISIBLE KNIFE IN BOX’. 


All components of SCP-2124, including the ink on the warning, 
appear to be made of standard material with no anomalous 
properties. SCP-2124 is as vulnerable to damage as any cardboard 
pizza box, and care should be taken during testing to avoid any 
deterioration. 


A human being attempting to consciously "pick up the knife" or "find 
the knife" is successful in finding such an object!, designated an 
instance of SCP-2124-1. Subjects describing SCP-2124-1 frequently 
describe it using the following terms: 


* "It feels almost like empty air." 
* "It feels like | could crush it.” 
* "It might slip out of my hand if | close it too hard." 


SCP-2124-1 has no detectable weight or measurable presence, 
other than the (often uncertain) word of the subject holding the 
instance that they are holding the object. However, when instructed 
to cut objects using an instance of SCP-2124-1, the object is cut ina 
manner consistent with a sharp kitchen knife. SCP-2124-1 is able to 
cut through soft objects with no appreciable effort, through meat and 
firm objects with simple effort, through bone with moderate effort, 
and through steel with considerable effort. 


Exact dimensions and properties of instances of SCP-2124-1 
appears to vary with test subject and testing conditions. See the 
abridged test log, below, for additional information. 


The interior of SCP-2124 appears to be empty to standard 
inspection, without any evidence of an instance of SCP-2124-1. All 
non-human interaction (sweeping with tongs, brushes, metal 
detectors) with the interior produces results consistent with an empty 
box. Blindly feeling around the interior of SCP-2124 also produces 
the same result. 


+ View abridged test log 
Test 2124-03 - 09/02/2012 


Subject(s): Researcher Clarent, under outside 
observation from Senior Researcher Knight 
and associated researchers. 


Events: After tests 2124-01 and 2124-02 
established the general properties of 
SCP-2124, Researcher Clarent tested the 
ability of SCP-2124-1 to cut various objects, 


especially those that are not normally easily 
damaged by a standard kitchen knife. All tests 
were performed in a standard Foundation 
testing room.