16 October 2018


Bone Folder

Paper scoring and folding

A classic bone folder $7 is made of real bone, not plastic or Teflon, and resembles a fat, blunt-edged tongue depressor, rounded at one end and pointed at the other. With it, I can turn a digital print, piece of cardstock or watercolor paper into a professional-looking note or greeting card.

Pulling the pointed end alongside a straight edge and across the paper produces a subtle score that facilitates a perfect fold. Next, I fold the card very gently by hand along the score, and then stroke one of the short, straight sides of the bone folder along the score to flatten the rounded fold to a sharp crease.

When sending a letter that I want to look good, I make two quick strokes of the folder along preliminary hand folds to create folded edges that are sharp and square. Bone folders also can be used to burnish paper as it is glued to cardstock, album or scrapbook pages. They produce accurate and sharp folds and creases on origami papers as well as facilitate sculpting, architectural modeling or bookbinding with paper.

I recommend rubbing your bone folder with olive oil from time to time to avoid flaking or brittleness. Folders made of real bone are best, unless you wish to use a Teflon folder to avoid the slight luster sometimes created by the friction of a real bone folder.

-- Clifford Peterson 10/16/18

(I relied on one of these while producing a large batch of homemade invitations and can attest to its utility. Here’s a look at a bone folder in use — editors)

15 October 2018


Fiskars Softouch Micro-Tip Pruning Snip

Precise garden snip

Fiskars’ PowerGear Bypass Pruner, previously reviewed, is the handiest, most used tool in my vegetable garden, but it’s too big and clunky for precision cutting of young salad greens and herbs. For that task, the company’s Pruning Snip is an outstanding and inexpensive tool.

Snipping action requires little effort because the short blades are quite sharp and a spring in the center of the handle returns the shear to its open position after each cut. A small garden scissors could work almost as well as the Fiskars Softouch Micro-Tip Pruning Snip ($12), but the spring-activated light-action cutting makes a big difference for ease of use. Like the larger pruner mentioned above, this model gives a lot of cutting output with disproportionately little input. This shear is also useful for carefully thinning densely grouped seedlings by cutting the excess plants at their bases.

-- Elon Schoenholz 10/15/18

(This is a Cool Tools Favorite from 2009 — editors)

14 October 2018


Goo Gone

Vanishing goo

Goo Gone ($7) is a liquid that helps remove adhesive residues. I’ve been using it for years to clean off the adhesive residue left from stickers, labels, tape, etc.

Let’s say you just bought a picture frame and removed the label from the glass. In order to remove that irritating, gummy adhesive residue left by the label, you just rub a bit of GooGone over it with a cloth and the goo is gone! No need to use a razor blade, acetone or other nasty solutions.

Not much of an odor, and an 8oz. bottle lasts for years since you use just a small dab each time!

-- Dale Burgham 10/14/18

(This is a Cool Tools Favorite from 2009 — editors)

14 October 2018


Freeze dried taxidermy/TSA-proof knife/Python Tutorials

Recomendo: issue no. 116

Freeze dried taxidermy
Occasionally a small bird strikes one of our windows and dies. Rather than bury it, I freeze dry it. I insert the whole bird into a baggie with a pack of desiccant to keep it dry. The desiccant gel slowly absorbs the moisture in the bird even after it freezes. After a year it is fully dried, and can be kept on a shelf or display indefinitely with all its feathers. This works on birds the size of a sparrow or smaller. — KK

TSA-proof knife
After decades of using a Utili-key as my choice of a small knife to pass through airport security, I lost it in the woods. I replaced it with Victorinox SwissCard. This tool is a mini-Swiss Army knife flattened into a plastic holder the size of credit card but thicker. It has a tiny (1.5 inch) sharp blade, scissors, tweezers, a pen, toothpick, and a pin. You can carry it in your wallet or bag. Goes through security. There is a knock-off version which remarkably adds a magnifier, a light, and four screwdriver heads in the same size card for half the price at $9 — but you’ll need to sharpen the flimsy blade. — KK

Python Tutorials
One of the things I miss about the 1980s was writing programs for fun in BASIC. A couple of years ago I started playing around with Python. It’s easy to learn, and powerful enough to do anything I would want to automate. Christian Thompson’s YouTube channel has wonderful Python tutorials for beginners. Check out the one on how to program a Pong clone. — MF

Advice book on Audible
At the behest of my best friend, I finally downloaded the Audible version of Tiny Beautiful Things, advice on life and love from Cheryl Strayed’s column Dear Sugar. The book is a collection of the most heartbreaking and honest letters seeking help and the advice given. Strayed’s thought-out responses pull from her own life experiences dealing with her mother’s death, drug addiction, divorce, and now as a happily married wife and mother. They are beautiful written and incredibly moving. This book elicits empathy, laughter and at times, lots of tears. There were a few times I was literally sitting in traffic and sobbing listening to her stories. I highly recommend. — CD

Read books in new languages
Parallettext.io is an online tool that helps you learn languages by reading a book in a foreign language with your native language side-by-side. You can click on any sentence to hear it out loud. I’m not sure how helpful it is to learn an entirely new language, but it’s useful for me to read in Spanish from time to time to remind myself of how sentences are structured differently. Right now, I spend a little time each day working my way through Alice in Wonderland. — CD

Cheap DVD Reader
No one in my family of four has a CD or DVD drive in their computer. That’s a good thing, because we rarely need one. When we do (usually to rip a movie or copy photos or music), I pull out this $15 USB CD/DVD drive and plug it into a laptop. — MF



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-- Kevin Kelly, Mark Frauenfelder, Claudia Dawson 10/14/18

13 October 2018


Theo Gray’s Mad Science

Dangerous home experiments

Theo Gray’s Mad Science ($17) is a rare home-chemistry book where the advice of “don’t try this at home” is, for once, appropriate. I usually complain about the scare mongering of home chemistry, but half of the experiments in this how-to book really are extremely dangerous. But the other half are pretty cool. There are no explicit step-by-step instructions given for any of the experiments, just guidelines of what to do. Gray, whose column appears in Popular Science, wants you to do some research and not just be a “script kiddie.” Stunning photos of what to expect from each project help. My son and I have done a few of these and they do work. The prime lesson engendered by this book is the sense that the material world is far more accessible to hacking than first appears.

-- KK 10/13/18


[warning box near instructions for combing sodium and chlorine to make table salt]
Real Danger Alert: This is the most dangerous experiment in this book. Sodium burns skin and eyes on contact and explodes when exposed to water in any form, sending flaming liquid metal in all directions at high velocity. Chlorine gas kills painfully and spreads rapidly. Under no circumstances should either of these chemicals be handled outside the presence of an experienced chemist. Combining them borders on lunacy.



FULL OF HOT AIR The exhaust port on a vacuum blows air from below, turning an ordinary grill into a raging inferno, capable of melting glass, iron, even itself if left unchecked.

All the components of glass can be found in two places: the beach and the laundry room. It's possible to melt pure-white silica beach sand into glass, but only at temperatures of 3,000 to 3,500°F. Washing soda, lime or borax (a traditional laundry aid) added to the sand disrupts the quartz-crystal structure of silica and reduces the required temperatures to a more practical, though still dangerous 2,000 °F, which I achieved with a backyard grill and a vacuum cleaner.

A charcoal fire fed with air from the bottom is hot enough to melt the combination of those materials into glass but not hot enough to make it truly liquid, so bubbles tend to remain and make the glass cloudy. I mixed the finely ground ingredients together and heated them in a cast-iron pot, then poured the molten glass into a graphite mold and pressed it down with a graphite stamp.

Soda-lime glass has the lowest melting point but must be cooled slowly to avoid shattering from the thermal stress.



PEPSI PAINTING Tinfoil distributes the current to form a pattern through a stencil and a layer of paper towel moistened with Diet Pepsi.


Homemade Titanium: With lots of heat, some flowerpots and common chemicals, you can turn raw ore into shiny metal.

An iron crowbar costs about $8; one made of titanium, $80. Solid-titanium scissors start at $700, and don't even ask about the titanium socket wrench. Titanium must be a rare and precious substance, right?

Actually, as raw ore, titanium is 100 times as abundant as copper. ... At temperatures high enough to melt it, titanium exposed to air catches fire. So it has to be refined, forged, welded, and cast in a vacuum or under inert gas--an expensive process.

Yet I was able to make titanium using equipment I had lying around. I did it with thermite reduction, a process commonly used to weld train tracks. In an iron thermite reaction, iron oxide reacts with aluminum and comes out as liquid iron. I just swapped in titanium dioxide instead. But that reaction, in which titanium dioxide transfers its oxygen atoms to aluminum, doesn't release enough heat to melt the materials.

So I mixed in drywall plaster (calcium sulfate) and more aluminum powder. They react to create huge amounts of extra heat, enough to melt the titanium and allow it to pool at the bottom of the container. Adding ground fluorite powder makes the molten metals more fluid and protects the titanium from air as it cools.

I used clay flowerpots, as suggested by Gert Meyer, who developed this procedure. When nested with sand between them, they last just long enough to let the titanium cool into beads of solid metal.

Many of the topics I write about are things I did when I was growing up, and I survived. Without those experiences I might have ended up as a stock broker, or worse.

Science is not something practiced only in labs and universities. It's a way of looking at the world and seeing truth and beauty everywhere. It's something you can do whether you are employed as a professional scientist or not. While I have a degree in chemistry from a fine university, I've never worked as a professional chemist. I do these demonstrations in my shop on a rural farmstead half a mile from the nearest neighbor. (This is handy when exploring the louder aspects of chemistry.) Mostly I use simple kitchen and shop supplies and chemicals from the hardware store or garden center. I do avoid working in a real lab, because I would much rather tinker in my shop and find a simpler (some might say cruder) way of making the experiment work. Amateur scientists, many of them self-taught, tinkering in their shops and basements have done great things. Using a spirit of making do with what they have and seeing just how far they can take it, they make real contributions to the advancement of science.


It makes me cringe when I see warnings to wear gloves and safety glasses while working with baking soda. It's called crying wolf, and it's deeply irresponsible, because it makes it that much harder to get through to people about real dangers.


Some other chemicals, however, are not your friends. Chlorine gas kills, and you hurt the whole time you're dying. Mix phosphorus and chlorates wrong and they blow up while you're mixing them. (I have a friend who still has tiny slivers of glass coming out of his hands twenty years after he made that particular mistake.)

Every chemical, every procedure, every experiment has its own unique set of dangers, and over the years people have learned (the hard way) how to deal with them. In many cases the only way to do an experiment safely is to find a more experienced person to help. This is not book-learning, it's your life at stake and you want someone by your side who knows what they are doing. There is an unbroken chain of these people leading right back to the first guy who survived, and you want to be part of that chain.

When I do an experiment that looks crazy I either have someone with me who's done it before, or it's something that I've worked my way up to slowly and carefully. I build in layers of safety, and I make sure that if all else fails I have a clear path to run like hell (and of course I wear glasses at all times).

(This is a Cool Tools Favorite from 2009 — editors)

12 October 2018


Laura Cochrane, Content Strategist

Cool Tools Show 144: Laura Cochrane

Our guest this week is Laura Cochrane. Laura Cochrane is a content strategist living in Berkeley, California. She currently works at NEO.LIFE, a biotech publication. Before that, she was an editor at two different DIY project publications: MAKE magazine, where she worked alongside Mark, and Instructables. Her hobbies include rock climbing, drawing, dancing, and yoga.

Subscribe to the Cool Tools Show on iTunes | RSS | Transcript | Download MP3 | See all the Cool Tools Show posts on a single page

Show notes:

Tom Bihn Daylight Backpack
A couple years ago, before a trip to Europe, I was on the hunt for a new day backpack. The JanSport I had had since high school had holes in it. I wanted something with a clean, minimal design. It’s actually a challenge to find a backpack that doesn’t have a bunch of random zip compartments, pouches, folds, mesh details, and gratuitous textures added for seemingly no reason at all. So I was excited when I found the Tom Bihn Daylight Backpack. It’s got a simple rounded trapezoid shape with a single diagonal zip that provides access to the front pocket. I got it in this really nice French blue color that looks good with most everything I wear. It also shipped fast, and as I recall there was a handwritten note thanking me for my order. It’s made in Seattle, and the quality is solid. I’ve stuffed it until it’s quite full and the seams have held up for the past two years as I’ve used it as a work commuter backpack.

I’ve loved this website for a long time. It’s an online photo gallery born out of the era of peer-to-peer filesharing. It was started in 2004 when a musician named Rich Vogel was using a filesharing program to find music and instead stumbled on a folder of photos. It’s still getting updated periodically, though I’m not sure how often. The collection is thoughtfully curated, like an epic mix tape. Though I can’t always put my finger on why one photo works so well next to another that seems unrelated in every way. When I want to be reminded of how beautiful the imperfection of real life is, I go here. These photos are often the mistakes, the ones the photographer never intended. Some are blurry, poorly framed, or double exposed. People have been captured with weird expressions or unflattering angles, but that’s part of the appeal. They’re stills from the cutting room floor of life. I find humor, horror, love, and glory, in a way that feels rare.

Audio Dharma podcast
Audio Dharma is a regularly updated collection of all the talks and guided meditations given at the Insight Meditation Center in Redwood City, California. A massage therapist recommended it to me after a particularly emotional session a few years ago. I started out mostly listening to the guided meditations, but lately I’ve been more into listening to the talks. They work well for someone who is listening in short bursts, so I’ll put it on for my 15-minute work commutes in the morning and evening. In moments where I’m feeling particularly stressed or sad, these talks can have the effect of helping me change what feels like a less-than-ideal metaphorical posture: when I’m overly focused on the future or the past I have this sense of leaning forward, like my mind is two steps ahead of my body. Audio Dharma helps me realign to something closer to upright — a posture of gentle curiosity. My favorite talks are the ones where the teacher picks a simple human experience, like uncertainty, desire, grief, or generosity, and they explore it in a way that usually leaves me feeling like I have a new perspective on a very common human experience. Most of the podcasts or music I listen to feel like they fill my head with noise that requires additional processing or decompressing afterward, but this feels like the opposite. To use a computer analogy, Audio Dharma defragments my brain.

PocketDisc crocheted frisbee
I like throwing around a frisbee, but I enjoy it even more with my crocheted frisbee. I don’t remember how I came into possession of one of these, but I love it. The main things that make it awesome are that it never hurts if someone throws it at you hard, and it folds up and can fit easily in pockets, purses, and bags. Also: it flies quite well, it can be given as a gift to people of all ages, and it’s safer to use inside the house. When I’m feeling silly, I’ve been known to flip it inside out and wear it as a hat. The only places I wouldn’t recommend it are around dogs, because I imagine they would quickly chew it to shreds, and on beaches. On the beach, the lip of the disc picks up sand when it lands on the ground, and then the next time someone catches it next, the sand gets released into the catcher’s face. I’m sure I could brush up on my crocheting skills and make myself one from scratch, but I feel like these are a good deal, for the money. They also make great gifts.



We have hired professional editors to help create our weekly podcasts and video reviews. So far, Cool Tools listeners have pledged $377 a month. Please consider supporting us on Patreon. We have great rewards for people who contribute! – MF



img 10/12/18

Knipex Pliers Wrench

Rapid, safe, strong pliers wrench

img 10/12/18

Master Lock Speed Dial

Faster combination entry than a standard combination lock

img 10/11/18

Bondic liquid welder

Plastic welding liquid cures in 4 seconds

img 10/10/18

Can-Gun 1

Comfy spray can gun

img 10/9/18

ART USB Phono Plus

Easily transfer audio from your vinyl records to your computer

See all the reviews


img 11/22/12

A Pattern Language

Design heuristics

img 09/5/05

Inflatable Life Jacket

Comfortable water safety

img 05/25/09

SunRun PPA

Zero Down Solar Panels

img 10/3/12

Murphy Bed

Next generation of hideaway beds

See all the favorites



Cool Tools Show 144: Laura Cochrane

Picks and shownotes

Cool Tools Show 143: Carl Bass

Picks and shownotes

Cool Tools Show 142: Anita Sarkeesian

Picks and shownotes

23 February 2017


Cool Tools is a web site which recommends the best/cheapest tools available. Tools are defined broadly as anything that can be useful. This includes hand tools, machines, books, software, gadgets, websites, maps, and even ideas. All reviews are positive raves written by real users. We don’t bother with negative reviews because our intent is to only offer the best.

One new tool is posted each weekday. Cool Tools does NOT sell anything. The site provides prices and convenient sources for readers to purchase items.

When Amazon.com is listed as a source (which it often is because of its prices and convenience) Cool Tools receives a fractional fee from Amazon if items are purchased at Amazon on that visit. Cool Tools also earns revenue from Google ads, although we have no foreknowledge nor much control of which ads will appear.

We recently posted a short history of Cool Tools which included current stats as of April 2008. This explains both the genesis of this site, and the tools we use to operate it.

13632766_602152159944472_101382480_oKevin Kelly started Cool Tools in 2000 as an email list, then as a blog since 2003. He edited all reviews through 2006. He writes the occasional review, oversees the design and editorial direction of this site, and made a book version of Cool Tools. If you have a question about the website in general his email is kk {at} kk.org.

13918651_603790483113973_1799207977_oMark Frauenfelder edits Cool Tools and develops editorial projects for Cool Tools Lab, LLC. If you’d like to submit a review, email him at editor {at} cool-tools.org (or use the Submit a Tool form).

13898183_602421513250870_1391167760_oClaudia Dawson runs the Cool Tool website, posting items daily, maintaining software, measuring analytics, managing ads, and in general keeping the site alive. If you have a concern about the operation or status of this site contact her email is cl {at} kk.org.