2026-04: finally lost the second Cateye Viz450, the attachment is just too crap

2026-03-23: old Cateye Viz450 not charing anymore, it seems that the usb charging port disconnected from the PCB, if I bend it a bit it charges, but it is hard. Tried to prope it open with flat screwdriver but failed, shame, not very repairable, I'd be able to solder if if I could open it. So that's the failure mode. Rebuying.

2025-11-06: bought another Cateye Viz450 for baby trailer.

2022-02: lost my Karrimor REFLEKT, must have fallen off from trouses somewhere.

2022-02: bought Burg Wachter Sold Secure Bike Chain, Lock and Ground Anchor Kit 1m, 10mm chain width: www.amazon.co.uk/Burg-Wachter-Sold-Secure-Gold-Chain/dp/B09MMGL9B7

2022-02 bought Kryptonite Kryptoflex double loop cable 1.2m length 10mm diameter braided steel cable: www.kryptonitelock.com/en/products/product-information/current-key/210818.html

2022-02: bought a Trelock BC 115/110/4 chain white for my saddle after Liv Flourish 2 (2018) the saddle of was stolen at home. Same as this but white: www.trelock.com/en/lock/locks/chain-locks/bc-115-110-4-green. The keys are a bit larger than I'd like.

2021-11: buying a Cateye ViZ450 www.cateye.com/intl/products/safety_lights/TL-LD820/ 51 dollars after CatEye RAPID X2 was stolen. Unfortunately, it is not very compatible with my Topeak saddle bag... the attachment is to wide to fit the saddble bag, and even if it did it is slanted to account for seat tube slant so it would not be very verfical. Arghh, they have futher options on the website: www.cateye.com/intl/products/parts/5342460/ that is the one I need, Clip C-2 or Clip C-1N. On Amazon it didn't have clear choices for that... mine came with the BracketSP-15. Ah, can buy on Amazon for 3 dollars, OK then.

2021-11: COZYROOMY multitool broke apart already, like before, but much sooner this time. What a piece of junk!!! Buying the Topeak Mini 18+ Bike Multitool www.topeak.com/global/en/products/75-Mini-Tools/173-mini-18+ Has a spoke wrench.

2021-09: COZYROOMY multitool stolen, even though it was completely in pieces already. 2021-09-21 12:30PM discovered, seat bag open, one tool on floor, and some leftovers inside, but black bag gone. Bicycle last seen 2021-09-20 6PM. Would likely have spotted it if it had happened before. Bicycle last used: 2021-09-19 6PM. Would almost for sure have seen it if it had happened by then. Rebought it.

2021-07 Topeak MTS Trunkbag EX Strap Type www.topeak.com/global/en/products/192-Rear-Rack-Bags/859-MTX-TRUNKBAG-EX Fit nicely on the back of the Kross bicycle (2017). 8L. Originally to carry some extra food and water on a long summer trip. 36 pounds.

2020-11-30: Bought more "Finish Line DRY Teflon Bicycle Chain Lube" 8oz/240ml www.amazon.com/dp/B00Z779GMO/ after previous disaster with the bottle because lock is a bit hard to open.

2020-11-30 WD-40 Bike, All Conditions Lube Bicycle Lubricant, 250ml. Markings: "Contains PTFE". www.amazon.com/dp/B00O8QF3PY Sprays out of bottle, so very thin.

2020-11: Park Tool CC-2 Chain Checker Tool www.amazon.co.uk/dp/B000OZFILW 24 pounds www.parktool.com/product/chain-checker-cc-2

2020-04: www.amazon.co.uk/gp/product/B014LC7HS0 "Park Tool HPG-1 High Performance Grease", 113 g, blue. www.parktool.com/product/high-performance-grease-hpg-1#tabbed-section | www.parktool.com/assets/doc/product/HPG-1_SDS.pdf

2020-02: CatEye AMPP500 45 pounds www.cateye.com/intl/products/headlights/HL-EL085RC/ High mode 500 lumens: 1.5hrs, Daytime HyperConstant mode 500/250 lumens： 5hrs. 2020-11: noticed it was cracked on top front between button and light, I think I dropped it the other day from waist height.

2020-02: Karrimor REFLEKT Band 2 pounds from Sports Direct to replace old that I destroyed by playing with it with hands on work desk www.karrimor.com/karrimor-reflect-band-765007

2020-01: Muc-Off Drivetrain Cleaner - 500ml www.halfords.com/cycling/bike-maintenance/bike-cleaning/muc-off-drivetrain-cleaner-500ml

2020-01: Halfords Microfibre Heavy Duty Cloths www.halfords.com/motoring/car-cleaning/sponges-brushes-buckets/halfords-microfibre-heavy-duty-cloths (archive) 87% polyester, 13% polyamide.

2019-12: www.amazon.co.uk/gp/product/B07GQSXN8B SENZEAL Bicycle Spoke Wrench Tool Spoke Key Spanner 6 in 1 for Bike Wheel Cycle Wrench 10-15 Gauge. TODO 2024: can't find those for the life in me.

2019-12: Halford's Bike Hut Chain Cleaning Kit: www.halfords.com/cycling/bike-maintenance/bike-cleaning/bikehut-chain-cleaning-kit 18 pounds. GCN video using it: www.youtube.com/watch?v=KM6mzE5lQ0w Review video saying it is useless: www.youtube.com/watch?v=rCo41pftAjU

2019-11: Multitool: www.amazon.co.uk/dp/B07MW3K2GK "COZYROOMY Bike Repair Kits - Bicycle tool kit with 10 in 1 Multi-Function Bike Tool, multi-purpose bone wrench And related spare tools, 1 Portable tool bag, 6 Month Warranty". No spoke wrench unfortunately. But does have 15mm bone wrench, which opens Kross front wheel. Some months later, the thing came apart, quality was a bit shit. But I kept it in the saddle bag anyways for a long time, and just used it by putting part of it manually together.

2019-11: "CatEye RAPID X2" real lights, 40 dollars. Hopefully to increase side visibility at night, and day visibility on fast roads when cycling further on weekends. www.cateye.com/intl/products/safety_lights/TL-LD710-R/ (archive) USB rechargeable. 80 lumens in high mode lasting 1 hour, 5 hours in low mode, 30 hours flashing, 16 hours rapid/pulse. Lost 2021-11 in a big city, didn't know the path well, had to cross a bunch of streets, was on back of back bag, likely stolen.

2019-10 WD-40 Smart Straw 450ml www.amazon.com/dp/B01MEHN4VC (archive)

2019-10 Finish Line Dry Teflon Tube www.amazon.com/dp/B00B704LZW (archive) Tube broke while opening the first day. I glued it with some superglue, but two months later found it leaked into my "oils bag", so I threw it away... it must have penetrated through the super glue.

2019-08: "CatEye CA475RAPMIN Rapid Mini Rear Lights and Reflectors, Black" stolen: www.amazon.co.uk/dp/B01I4193PY (archive). Very good quality. Those USB rechargeable lights you just have got to take off with you whenever parked in town or else drug addicts will steal them because they are easy to remove for recharging. Tempted to just stick to dynamo ones that are screwed in. Re-bought original back light: AXA Basta, was a bit different from previous one, cannot take in lamps anymore, even though there is the plastic casing for them! Just not metal / wires.

Black EUR 44, 1 smaller than normal size as recommended by website.

Bought SM-SH56 cleat to accompany.

When it arrived, it felt a bit too long, around 2cm maybe free space after toe, and when I walk and the front part touches ground, heel comes off a bit, which is annoying. But I was too lazy to give it back and take the risk of a second try, also it felt correctly tight on sides. During first test ride it felt good.

It is slightly water proof. But if it rains a lot, it will get soaking wet. And once it does get wet, it feels like it is very very hard to dry, there don't seem to be any holes underneath.

Arity is a concept that refers to the number of arguments or operands that a function or operation takes. It's commonly used in mathematics and programming to describe how many inputs a function requires to produce an output. For example: - A function with an arity of 0 takes no arguments (often referred to as a constant function). - A function with an arity of 1 takes one argument (e.g., a unary function).

Ciro Santilli is a fan of this late 2010's buzzword.

It basically came about because of the endless stream of useless software startups made since the 2000's by one or two people with no investments with the continued increase in computers and Internet speeds until the great wall was reached.

Deep tech means not one of those. More specifically, it means technologies that require significant investment in expensive materials and laboratory equipment to progress, such as molecular biology technologies and quantum computing.

And it basically comes down to technologies that wrestle with the fundamental laws of physics rather than software data wrangling.

Computers are of course limited by the laws of physics, but those are much hidden by several layers of indirection.

Full visibility, and full control, make computer tasks be tasks that eventually always work out more or less as expected.

The same does not hold true when real Physics is involved.

Physics is brutal.

To start with, you can't even see your system very clearly, and often doing so requires altering its behaviour.

For example, in molecular biology, most great discoveries are made after some new technique is made to be able to observe smaller things.

But you often have to kill your cells to make those observations, which makes it very hard to understand how they work dynamically.

What we would really want would be to track every single protein as it goes about inside the cell. But that is likely an impossible dream.

The same for the brain. If we had observations of every neuron, how long would it take to understand it? Not long, people are really good at reverse engineering things when there is enough information available to do so, see also science is the reverse engineering of nature.

Then, even when you start to see the system, you might have a very hard time controlling it, because it is so fragile. This is basically the case of quantum computing in 2020.

It is for those reasons that deep tech is so exciting.

The next big things will come from deep tech. Failure is always a possibility, and you can't know before you try.

But that's also why its so fun to dare.

Stuff that Ciro Santilli considers "deep tech" as of 2020:

12-inch adjustable wrench.

Bought: 2020-11-07 initially for using with park Tool BBT-22.

2026-06: www.amazon.co.uk/dp/B0DQCV9JV6 AMagnetic Torx Screwdriver Set 12pcs: T5x3", T6x3", T7x3", T8x3", T9x3", T10x3", T15x3", T20x3", T25x3", T27x3", T30x4", T40x4". I've had enough of not having those.

2026-02: www.amazon.co.uk/dp/B0FCWSVXM8 "DCA Cordless Drill Set, 40 N.m Torque, 10mm Keyless Chuck, Electric Power Drill with 2.0Ah Battery and Charger,18+1 Position,35-Piece 20V Drill Driver Kit, ADJZ2035". Finally had to buy a drill set for some bloody Ikea furniture that needed drilling. OMG. Then it didn't have the necessary 7,00 mm wood drill bit, they were not documented by seller, but I bought one from Bosch and it was compatible and I managed to put up the bloody Ikea. Drill bit sizes:The included screw bits are:

2020-01 www.amazon.co.uk/dp/B07D318N7Z BOENFU 12Pcs iPhone Repair Tool Kit Mobile Phone Screwdriver Set with LCD Opening Pliers Cell Phone LCD Screen Opener Suction Opening Pry Tool Kit for iPhone X/5s/6s/6plus iPad Air iPod Samsung Galaxy

2020-01 "Heat Gun, SEEKONE Professional 2000W 50℃- 600℃ Variable Temperature Control Hot Air Gun Kit with 2 Temperature Modes 7 Accessories for D" www.amazon.com/dp/B078S5QMFG Initially for for cell phone repair, but later learnt they are also useful for heat shrink.

2020-11 BOA 13-2612 Strap Wrench, 6-Inch Capacity 8-Inch Long Lever www.amazon.com/dp/B00096JDKS Official: www.boatoolcorp.com/our-products/boa-constrictor-range/boa-constrictor/

2019-09 "Draper Redline 68001 160 mm Heavy Duty Pliers Set with Soft Grip Handles (3-Piece)" web.archive.org/web/20190903191215/https://www.amazon.co.uk/dp/B071JL6LLL (archive)

2019-08: www.amazon.co.uk/dp/B000LFRYG2 (archive) "Silverline SP1236 Combination Spanner, 8-19 mm - 12 Pieces" 8.48 pounds. Because I needed the 15mm for bike pedal, and the price of 1 and the full set were very close.

6 10/11/12/13/14/17 mm Combination Wrench Set WRENCH SET COMBINATION Open-Ended Spanner/Ring Spanner Set www.amazon.co.uk/dp/B07BZLVGX8 (archive) But they sent one wrong, 8 instead of 11. Chrome Vanadium Steel. Markings: "DROP FORGED A". Quality feels crappy, not very smooth.

2017: Teng 621011 Double Open Ended Spanner 10x11mm www.amazon.co.uk/dp/B0001P0VP8 (archive)

2017: Magnusson AMS49 5M TAPE MEASURE 5m retractable flexible rule. www.screwfix.com/p/magnusson-ams49-5m-tape-measure/5315v (archive)

Physical phenomena refer to observable events or occurrences in the natural world that are governed by the laws of physics. These phenomena can be categorized into various types based on their characteristics and the physical principles that describe them. Examples of physical phenomena include: 1. **Motion**: The movement of objects, including concepts like velocity, acceleration, and momentum. 2. **Forces**: Interactions that cause changes in motion, such as gravitational, electromagnetic, and nuclear forces.

Classical probability density refers to a function that describes the likelihood of a continuous random variable taking on a specific value within a given range. It is a key concept in the field of probability and statistics, particularly in the context of continuous probability distributions. Here are some key points about classical probability density: 1. **Probability Density Function (PDF)**: The probability density function is the mathematical function that defines the probability density.

The term "covariance group" can refer to different contexts in mathematics and physics, often related to how certain structures behave under transformations. However, it is not a widely used or standardized term like "group theory" or "covariance" in statistics or relativity. In general, covariance is a measure of how two variables change together.

A physical object is anything that has a tangible presence and occupies space. This means that it has specific dimensions (length, width, height), mass, and is made of matter, which can be solid, liquid, or gas. Physical objects can be perceived through our senses, particularly sight and touch.

Quantum non-equilibrium refers to the state of a quantum system that is not in thermodynamic equilibrium. In thermodynamics, systems at equilibrium exhibit well-defined macroscopic properties, such as temperature and pressure, and statistical distributions of their internal states (like the Boltzmann distribution). In contrast, non-equilibrium systems display time-dependent behavior and can have spatial gradients in quantities such as temperature, chemical potential, and density.

Analytic philosophy is a tradition in Western philosophy that emphasizes clarity of expression, logical reasoning, and the use of formal logic to analyze philosophical problems. This approach emerged in the early 20th century, primarily in the English-speaking world, and is often contrasted with continental philosophy, which may focus more on historical context, existential themes, and subjective experience.

The Analytical Society was a group formed in the early 19th century, primarily in Britain, that aimed to promote the use and understanding of analytical methods in mathematics, particularly calculus. Founded in 1813, it was a response to the predominance of the traditional calculus taught in British universities, which was often based on the work of Newton rather than the more rigorous methods developed by mathematicians like Joseph-Louis Lagrange and Augustin-Louis Cauchy.

A tensor is a mathematical object that generalizes scalars, vectors, and matrices to higher dimensions. Tensors are used in various fields such as physics, engineering, and machine learning to represent data and relationships in a structured manner. ### Basic Definitions: 1. **Scalar**: A tensor of rank 0, which is a single number (e.g., temperature, mass).

Geometry is a branch of mathematics that deals with the properties, measurements, and relationships of points, lines, shapes, and spaces. It encompasses various aspects, including: 1. **Shapes and Figures**: Geometry examines both two-dimensional shapes (like triangles, circles, and rectangles) and three-dimensional objects (like spheres, cubes, and cylinders). 2. **Properties**: It studies properties of these shapes, such as area, perimeter, volume, angles, and symmetry.

Graph theory is a branch of mathematics and computer science that studies the properties and applications of graphs. A graph is a collection of nodes (or vertices) connected by edges (or arcs). Graph theory provides a framework for modeling and analyzing relationships and interactions in various systems. Key concepts in graph theory include: 1. **Vertices and Edges**: The basic building blocks of a graph. Vertices represent entities, while edges represent the connections or relationships between them.

Mathematical analysis is a branch of mathematics that deals with the properties and behaviors of real and complex numbers, functions, sequences, and series. It provides the rigorous foundation for calculus and focuses on concepts such as limits, continuity, differentiation, integration, and sequences and series convergence. Key topics within mathematical analysis include: 1. **Limits**: Exploring how functions behave as they approach a specific point or infinity.

**Probability and Statistics** are two related but distinct branches of mathematics that deal with uncertainty and data analysis. ### Probability Probability is the branch of mathematics that deals with the likelihood or chance of different outcomes occurring. It provides a framework for quantifying uncertainty and making predictions based on known information. Some key concepts in probability include: - **Experiment**: A procedure that yields one of a possible set of outcomes (e.g., rolling a die).