The Jimi Wallet is a minimalist hard-shell plastic case design. It’s the perfect antidote to the “Costanza Wallet” syndrome my dad had, because it forces you to discard all but what you really need.

The Jimi has room for exactly three pieces of plastic, a security access card, and a money clip that holds 5-6 bills. That’s it.

The Jimi pops open with a bit of pressure applied to a few dimples. You can do it easily with one hand without looking.

I have owned several Jimis over the last decade. The build quality is excellent. Realistically, I find that I get three years of daily use out of one before the plastic joint starts to fray. I am okay with this, because it gives me the opportunity to get a new color.

I’ve got nothing against slim leather or cloth wallets, but the Jimi is what works for me. It was the wallet equivalent of coming in from the cold. I can say with no exaggeration that I get a minimum of one compliment a week on it when I pull it out in stores or restaurants. People see it an intuitively get that it’s an evolution.

-- Pete Forde

Jimi Wallet
$15

Available from Amazon

Manufactured by Jimi

Cool Tools is giving away a copy of the book, Getting Started with Arduino* to one person who signs up for the Cool Tools Newsletter between now and Thursday, May 23 at 10pm PT. (Current newsletter subscribers are automatically included in the running.)

From the publisher’s description:

Arduino is the open-source electronics prototyping platform that’s taken the design and hobbyist world by storm. This thorough introduction, updated for Arduino 1.0, gives you lots of ideas for projects and helps you work with them right away. From getting organized to putting the final touches on your prototype, all the information you need is here!

Inside, you’ll learn about:

Interaction design and physical computing
The Arduino hardware and software development environment
Basics of electricity and electronics
Prototyping on a solderless breadboard
Drawing a schematic diagram
Getting started with Arduino is a snap. To use the introductory examples in this guide, all you need an Arduino Uno or earlier model, along with USB A-B cable and an LED. The easy-to-use Arduino development environment is free to download.

Join hundreds of thousands of hobbyists who have discovered this incredible (and educational) platform. Written by the co-founder of the Arduino project, Getting Started with Arduino gets you in on all the fun!

We’ll pick one newsletter subscriber at random to receive the giveaway. We hold giveaways every Friday, so if you aren’t selected this time, try again next week.

(* I am an editor at Make, a magazine that is owned by the company that published Getting Started with Arduino).

-- Mark Frauenfelder

Getting Started with Arduino, by Massimo Banzi
128 pages
$8

Available from Amazon

OXO has a serious presence in my kitchen, but the one- and two-cup adjustable measuring cups I added four months ago might be the last items I would sell. They are darned near perfect.

I’ve used other plunger-and-sleeve style adjustable measuring cups, and they were great for measuring odd quantities or volumes without using several different-sized cups (or one size several times), but sticky or oily stuff got in between the plunger and the sleeve, making reuse impossible without stopping to disassemble and clean the cup.

OXO has taken a page from the AeroPress coffee maker and solved this problem by using a similar gasket on the end of the plunger that seals against the sleeve and pushes the measured item out. The plunger rides in helical grooves in the sleeve, so one twists to adjust the measurement or eject the measured item. This makes additive measurements of a second item easy and allows more controlled ejection, too.

The grooves stop short of the extent that would allow you to pull the plunger from the bottom of the sleeve, ensuring that the gasket wipes the sleeve. End result: the only part you usually wash is the gasket itself.

The sleeve is marked in multiple units, with one set for liquid measure and one set for dry; the latter assumes some empty space at the top, great for coarse items, lightweight flours — and shaky hands.
These fulfill OXO’s stated mission of not just reproducing tools, but finding ways of improving the functionality by a noticeable amount.

-- Pierce Presley

OXO Good Grips 2-Cup Adjustable Measuring Cup
$12

Available from Amazon

Once you get hooked on foraging for wild mushrooms, you begin to wonder why you can’t just farm them. Picking mushrooms from your backyard or basement would sure be a lot easier than roaming the hinterlands. Well, so far about 30 different kinds mushrooms can be cultivated, although none of the techniques are trivial. The delicate operations needed to produce sterile “soil” and inoculate the spores has been streamlined for some species (by using pre-inoculated plugs), but there is still a lot of skill and laboratory expertise needed to grow the rest. Most of what is known about mushroom cultivation has been distilled into the 3rd edition of this irreplaceable book. This is simply the best guide to growing edible, medicinal, and psychoactive mushrooms.

This is a fast-changing field where enthusiastic amateurs lead the way. To keep up with new possibilities, check the authors website at Fungi Perfect. Farming mushrooms is also becoming a business, and the Mushroom Growers’ Newsletter is the hub.

-- KK

Growing Gourmet and Medicinal Mushrooms
Paul Stamets
2000, 614 pages
$30

Available from Amazon

Sample Excerpts:

In one of my outdoor wood-chip beds, I created a “polyculture” mushroom patch about 50 by 100 feet in size. In the spring I acquired mixed wood chips from the county utility company–mostly alder and Douglas fir–and inoculated three species into it. One year after inoculation, in late April through May, Morels showed. From June to early September, Kind Stropharia erupted with force, providing our family with several hundred pounds. In late September through much of November, as assortment of Clustered Woodlovers (Hypholoma-like) species popped up. With noncoincident fruiting cycles, this Zen-like polyculture approach is limited only by your imagination.

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[click for larger]

After years of carrying around a repair kit of bits and pieces for my biking excursions I decided to upgrade and replace almost all my bike gear. I came across this patch kit in a shop in London. Its a small aluminium sleeve containing adhesive patches, a tire boot (for those occasions when you need to patch the tire as well as the tube) and a scuffer to rough up the area of the tube before applying the patch.

The package also includes two strong nylon tire levers, which double as end caps for either side of the sleeve, neatly ensuring that everything stays together in your pocket or bag. This little kit, together with a spare tube and mini pump, is all I need to carry out when I go for a ride. The sleeve comes in various color options and I have a seen a few different shops sell them custom branded with their logos on.

-- Jeremy Gould

Lezyne Lever Kit
$9

Available from Amazon

Manufactured by Lezyne

Earlier this year I purchased a Parker Jotter stainless steel pen based purely on its cool factor as being the pen that James Bond used in the 1995 film Goldeneye, as I had seen on the Bond Lifestyle web page. I searched for it online and ended up purchasing one from my local office and art supply store. I appreciated its sleek design and modest price coupled with the cool factor instantly… but the more I used the pen during my work days the more I came to appreciate it, for you see this pen ultimately changed my life.

As a teacher I am called upon to sign documents on a near daily basis — sign this attendance report, sign this behavior report, write a tardy slip, sign this check out form, etc. It seems never ending. I found myself constantly fumbling for a pen, having to borrow pens that had bits of tape on them or had been turned into paper-mache flowers to make sure they didn’t “walk away” in someones pocket. It was humiliating, but what is one to do when operating on a modest teacher’s salary? Plastic pens were pedestrian and forgettable, clicking gel pens with oversized rubbery cushioned grips were tedious when removing or inserting into the standard pen-socket that my button up shirts provided. Only the Parker Jotter was suitable for my needs! Its slippery profile glides into my shirt pocket, the light weight barely noticeable. It is easily retrieved and the polished components in the pen cap provide the authoritarian click that I need to sign these endless cascades of documents with prudence. Its smooth writing allows my own graceful chicken scratch to be properly rendered, with little hand cramping during extended grading sessions. At a modest price of between $10 to $15 for the stainless steel model, this classic writing implement should be owned by all. When I rise at the ungodly hour required and begin my daily rituals of preparing for my work life, I experience a sense of satisfaction when I pick up my Jotter and realize there is one more thing to look forward to.

Compared to similarly priced models the Parker Jotter provides value. I have a Zebra F-301 that I carry as a backup and find the design to be over wrought, with a useless and slippery plastic grip. It feels like I am scratching the paper compared to the Jotter. Anyone that appreciates the classic slip stream design of the 60s will fall in love with the Jotter, just as I have.

-- Seth Wilson

Parker Stainless Steel Jotter Pen
$11

Available from Amazon

I use well-seasoned cast iron and carbon steel pans for the better part of my cooking. To clean them, I’ve used the same bamboo wok brush than I bought at a corner market in Sacramento in 1990. I’ve been thinking of buying a new one, just so I can phase it in over a few years while I slowly retire the original. It only takes a few swishes around the inside of the pan with hot water (no soap!) and a rinse to clean a pan. In the time I’ve been using it on my iron and steel pans, including the wok I use occasionally, I’ve gone through countless sponges, scotch-brite pads, and those looped-plastic scrubbies that I use on stock pots etc., all of which get pretty hinky once put into use and have to be run through the dishwasher to get free of food particles. It also looks dignified and fine sitting on the countertop by the sink, has just gotten more seasoned, and never needs more than a rinse to get clean. The edges of the cane bristles are pretty blunted by now and a new one might work better for attacking the occasional nuclear cooking mess. On the other hand, it’s gentle enough on the built-up seasoning in my pans that they keep getting non-stickier and shed scorched cheese like schmutz on teflon.

The brush I bought way back when has flat bristles, about 11 inches long by 3/16 wide, and stouter than most of the wok brushes I’ve seen recently in Asian groceries. I can’t imagine that there’s been much innovation in wok brush technology in the last 3000 years, but quality is probably inconsistent on an item like this, even from the same seller. Unless you have access to Asian markets and can shop around while you’re out making your weekly durian run, Amazon has a variety to choose from, all about $7.50 with shipping. The Wok Shop seems to be reputable, but it might be prudent to order a few just in case yours only lasts as long as a good hamster.

-- Brian Garber-Yonts

Bamboo Wok Brush
$7

Available from Amazon

The Glowdoggie Ultra is a German-engineered LED lighted dog collar. It allows you to see your dog at night, at a distance. I have had my Glowdoggie collar for about 4 months now. As a professional dog trainer I have seen many, many different collars, and this collar far exceeds the run of the mill LED collar in a number of ways.

Firstly it is waterproof. I have tested this thoroughly, and it lives up to its claim of being 100% waterproof. Secondly, it is compatible with rechargeable batteries. This is a big plus if you are using an LED collar regularly. The company also guarantees their collars for 2 years. After four months of regular usage, I see literally no wear and tear on this thing, so I think it will far exceed the 2 year warrantee.

The biggest plus of these collars are the fact that they are intensely bright. With a dog off leash at over 100 yards the collar in clearly visible with no other lighting around. This is partly due to the fact that unlike many LED collars the Glowdoggie does not flash but instead remains a constant source of light. Contrary to my initial thoughts, this does not have any noticeable drain on the batteries compared to some of the other battery powered collars that flash.

All in all this is one of the best LED collars available on the market today, and comes to you, batteries included.

-- Josh Moran

Glowdoggie Ultra
$63

This a book about how to hide from people who want to find you, such as ex’s, disgruntled associates, opportunistic lawyers, private investigators, stalkers, the press, etc. Hiding means obscuring your identity. It is not about hiding from governments, because as Luna observes, “privacy” is a matter of economics; anyone can be found using enough money, which is what governments have. Luna classifies the 4 levels of obscurity one can achieve by assigning them 4 levels of money paid to find you. Level 1 is hundreds of dollars, Level 2 thousands, and Level 3 tens to hundreds of thousands. Level 4 is the government. The more it costs to find you, the harder you have to work to remain hidden.

This book reveals the many tricks one can do to hide your location, your assets, your identity, while still paying your taxes. Most of these tricks are legal, or at least in the gray zone of “not outright illegal.” (For instance, by supplying true but irrelevant facts, rather than stating something false.) There are many legitimate reasons for not wanting to be found by someone (spousal abuse, escaping revenge, identity theft, etc.) but I think the overriding one that motivates this book is the fear of having assets seized in a frivolous “deep pocket” law suit.

What is clear from this guide is the degree to which one has to disconnect from ordinary connections in order to achieve the higher levels of obscurity. Very few people will want to live with the constraints required to completely mask your true identity. Yet you are only as hidden as your weakest link, which could be one of a thousands everyday connections such as an old account, forgotten password, unexpected stop at a border, or an old friend. Higher levels of disappearing demand relentless attention, and in many ways privacy becomes a full-time obsession, as it has for the author.

Even though he tries hard in this third edition, Luna is not keeping up to date with the digital world. Hiding is harder, but there are also new opportunities as well. However because Luna advises people to stay off social networks, he is not ahead of the curve. (These days if you don’t have a Facebook account full of friends, that is a sign you are fake.) A younger generation will have a harder time implementing these tactics, although the strategy remains the same.

I live my life in the complete opposite direction from what this book advocates, being as transparent and open as possible at all times. Life is too short, and openness has treated me well. Luna would call this naive, and it probably is. There are not many of his suggestions I will actually follow, because I am not battling an ex, not running from the press, not trying to hide assets from unscrupulous lawyers. But as the author notes, the time to enable privacy is before you need it.

Like many other tools, it’s good to know these options exists, even if you have no plans to use them now. Being aware of what possibilities we have for deep disguise and obsessive privacy is empowering. And of course, if you are trying to find someone, this book has all the tricks they may be using. I learned tons and consider it a bargain education.

-- KK

How To Be Invisible
J. J. Luna
2012, 320 pages
$17

Available from Amazon

Sample Excerpts:

Level Three

This will almost certainly require a move from your present location. Both your home (or rental property) and you vehicles will be in the names of anonymous limited liability companies (LLCs). Your home address will now be hidden from all but your closest relatives and friends. It will no longer appear on your annual tax returns, or anywhere else. If you follow the directions in chapter 12, “E-mail and the Internet,” your Internet/e-mail connections will be under cover and the black-hat boys and/or law firms may have to pay a PI some truly serious money to track you down. Are you worth that much to them? If not, sleep well.

*

I learned this one from a FEMA (Federal Emergency Management Agency) agent I met, while staying in a motel that was near a flooded area. Some years ago he bought a $98,995 motor home under another name, and did not license it. (He thus saved not only the license fees and road tax, but an $8,513.57 sales tax as well.) For $12 he got a fifteen-day permit to move it to a rural location in another state. From time to time he moves it, each time getting a temporary permit. Try to find out where this agent actually lives!

*

Watch For This Sneaky Trick

Suppose a private investigator wants to hear you talking to your lawyer (or mistress, or whomever). He may place a conference call, recording every word. Here is how it works. The first call would go to you, and when you answer, the PI punches HOLD and then speed-dials your lawyer. you start saying, “Hello? Hello?” Then your lawyer comes on the line. He recognizes your voice. Each of you may then assume the other person placed the call, and start to chat!

*

Suppose you wish to send $25,000 from Vancouver, British Columbia, to a friend in Helsinki, Finland. You would hand $25,000 cash to a Vancouver money changer (Hawaladar) in Vancouver, and receive code words (or an agreed signal such as a secret handshake) and a contact address in Helsinki. No actual cash moves out of Canada. Instead, when your friend gives the code to the correspondent hawaladar in helsinki, he will receive the equivalent in euros (less a commission) from money that is already there. To review:

-There are no written documents. The exchanges are based on mutual trust (perhaps for that reason unpopular in the United States?).

-Only local currencies are used. Thus, if you are sending money from the UK to Mexico, you pay in pounds and the receiver in Mexico collects in pesos.

-This exchange cannot be traced because no money crosses a border.

*

Since the IRS treats one-member LLCs as sole proprietorships for tax purposes, there are no income tax consequences. If you use your LLC for a part-time business, for example, you will merely report earnings and expenses on Schedule C and submit it with your 1040 tax return. Repeat: The income – -if any — is listed on your personal tax return. Nowhere on the tax form will the name of your limited liability company appear. As far as the IRS is concerned, your limited liability company is invisible.

“How can I prove I own the company,” I’m often asked, “if my name doesn’t appear anywhere?” If privacy is the goal, I recommend New Mexico LLCs because they do not show ownership in the Articles of Organization (which are a public record). The best way to prove ownership, then, is to have the original LLC documents coupled with an operating agreement.

Cool Tools is giving away a one-year subscription to TripIt Pro ($49 value) to one person who signs up for the Cool Tools Newsletter between now and Thursday, May 16 at 10pm PT. (Current newsletter subscribers are automatically included in the running.)

Here’s my TripIt review on Cool Tools.

We’ll pick one newsletter subscriber at random to receive the giveaway. We hold giveaways every Friday, so if you aren’t selected this time, try again next week.

-- Mark Frauenfelder