Mastodon - Open Source Decentralized Facebook/Twitter Alternative

Read all about it.

"Mastodon is a decentralized social network that uses standard interoperability protocols and is completely [FOSS]. What this means is that anyone can run a Mastodon server, and the users of those servers can talk to each other. More than that, non-Mastodon servers are also part of this network if they conform to the same protocols. This means that Mastodon is more future-proof than Facebook or Twitter: Even if Mastodon-the-software falls out of fashion, the network can be simply continued by other interoperable software. You don't have to tear out your entire social graph to have all friends migrate to something new if that happens. Furthermore, Mastodon allows self-determination and control. When you run a server, it's yours. Your rules, your community, hosted on your hardware... you don't depend on anybody, definitely not on a [Silicon Valley headquarters]."

from BoingBoing

Find me at @collapsibletank@mastodon.social

Nadal

Rafael Nadal looks like Tom Cruise with his face smushed against a window.

Think Twice

There are a number of great maths channels on YouTube, such as Numberphile and Mathologer - but the most beautiful and elegant is Think Twice, where smart and smooth animation visualises otherwise complex formulae or theorems. For example, here's the derivation and properties of the Dragon Curve.

(Mr Puzzle has a nice review of some laser-cut puzzles including a Dragon Curve one here.)

Ancient Beech in Ill-considered Leggings

A return to a tree in Danes' Wood I'd only seen out of leaf, and which was hard to find with the wood in its summerwear. Turns out it's a beech and I can't tell my arse from my arbour.

Surprisingly tricky, requiring quite a lot of repositioning in order to get a good enough line for several of the re-pitches, but each stage was quite short.

The tree branches considerably all the way up, so there are a lot of choices to make, but once at the top you can move from place to place relatively easily with a long lanyard to play with. Also - great for limbwalking.

Inevitably I'd climbed about one metre higher than my rope would allow for a return to ground, and because of being too lazy to climb up and move my anchor point, I ended up using my lanyard to unclip from my zig-zag and drop to earth with my foot ascender still attached. Getting cramp in your supporting leg while trying to detach from a foot-ascender is both hilarious and agonising in equal measure.

Summertime

Aw yiss... 

Noah Lee - "Julie-O"

The whole of this is great, but Noah Lee's piece is really special.

BETTER Dancing in Movies

There's a video doing the rounds this week called Dancing in Movies, and it's proving to be impossible to avoid. 1.5 million plays on Vimeo. Virality huh... But it's no good. The tracks he chose are agonisingly undanceable and it doesn't match satisfyingly with any of the actual dancing, much of which is amorphous. It's just random clips of dancing with a weak musical backing.

This one, on the other hand, from three years ago, is an absolute classic. Every clip is achingly skillful, the track (Uptown Funk) is the most leg-twitchingly danceable track ever produced, and the dancing actually fits the rhythm of the song, which you'd think would be fundamental to a project of this type.

Raising Sophisticated Young Ladies

Shaldon Ness

A beautiful day on Shaldon Ness this afternoon. First up a handsome Copper Beech on Ness Drive with the sun coming through the leaves.

This one is definitely a contender to house a couple of hammocks. Fairly quiet and easy to hide in, but very leafy so not much view; which is a shame because in winter you can see right along the coast. Then up a tall oak that overlooks the car park in one direction, but in the other direction - open sea! This is fantastic.

Trees at the top of cliffs are a real treat. I was up a different tree on the same headland last week and a helicopter flew past beneath me!

Today, I was waving at paddle-boarders. There's not a lot of cover in this oak...

Really special.

Five Old Blokes and a Million Kids

AC/DC in their still-rocking dotage. Worth it if only for the jumping crowd at 2m27s.

Shaldon Ness climbing

Too much new growth for a hammock these days, sadly. Still lovely though.

The Poor People's Campaign

This is a good introductory (to me at least) piece on the Poor People's Campaign. I wanted to say something like "and so it begins", but it has been actively running for five weeks with little in the media to show for it. This article asks why.

It ends with this excellent photo-essay.

DEET and Climbing Ropes

There was an interesting conversation at the RTCUK Sleepover about DEET maybe degrading climbing ropes. It was scary enough to make you think twice about risking Lyme's or a nasty fall. After all, as a solvent DEET will melt plastic and denature your sunglasses, camera and so on.

I couldn't find anything definitive online, but everything you can find points to this quote from a report which now seems to be unavailable:

“Summary of Nylon, PET and Spectra Chemical Resistance to DEET

Many climbers have in the past worried about the effects of accidentally spilling bug repellent on their climbing ropes. The following is the result of preliminary testing of deet and other bug repellent chemicals.

Samples of nylon, polyester, and spectra were submitted for chemical resistance testing for DEET (N,dimethyl-m-toluamide). The three samples were immersed separately in “CUTTER” and “OFF” brand insect repellent for a period of twenty-four hours at room temperature. “OFF” contains 95% Deet (N-dimethyl-m-toluamide) while “CUTTER” contains only 7% Deet and probably some oil based solvents as well. The results of the testing indicate no loss of strength as measured by tensile strength retention in any of the three samples.

There was one interesting anomaly that occurred only in the case of Nylon and the “CUTTER” brand insect repellent. As mentioned before there was no loss of strength for any of the samples but here there was a 25% increase in the elongation and a decrease in modulus. This basically means that a rope made entirely or mostly out of Nylon may become “rubbery” with a significant amount of exposure to “CUTTER” or other insect repellents with large amounts of oil based solvents.

However, with regard to the chemical in question, DEET, there appears to be no effect on any of the physical properties of the three samples. Hence as “CUTTER” contains only 7% DEET the change in the Nylon elongation and modulus must come from the other solvents in the product. It is suggested that if a rope has significant amounts of Nylon to use insect repellents with 95-100% Deet instead of ones with some Deet and large amounts of other oil based solvents.

Please keep a major factor in mind in regards to this study/testing. The only two brands tested were OFF and Cutter and were specific formulas of those brands. So we can’t necessarily say that all bug repellent products with DEET will not harm the stated materials. Other brands and other formulas could contain a substance other than what was in the two formulas tested. In other words, it is probably safe to say DEET itself has no effect but there can be other chemicals in other repellents that may.”

— Honeywell Performance Fibers

Personally, I'm taking this as permission to not worry. The most up-to-date forum discussion about this I could find was this one, and there seem to be no accounts online of rope failure after DEET contact. Your mileage may vary, but for me avoiding the relative certainty of again having to extract gangs of voracious parasites from my nethers beats the theoretical risk of equipment failure.

Hit Like a Girl - Yokoya

Yaaaaaaaaaaaaaaaay!

Protecting the Free and Open Internet: European Edition

Reddit has summarised the European attempt to destroy the internet for everybody. Here it is in its entirety, though click through to the site for the comments.

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Hey Reddit,

We care deeply about protecting the free and open internet, and we know Redditors do too. Specifically, we’ve communicated a lot with you in the past year about the Net Neutrality fight in the United States, and ways you can help. One of the most frequent questions that comes up in these conversations is from our European users, asking what they can do to play their part in the fight. Well Europe, now’s your chance. Later this month, the European Parliament’s Legal Affairs Committee will vote on changes to copyright law that would put untenable restrictions on how users share news and information with each other. The new Copyright Directive has two big problems:

• Article 11 would create a "link tax:” Links that share short snippets of news articles, even just the headline, could become subject to copyright licensing fees— pretty much ending the way users share and discuss news and information in a place like Reddit.

• Article 13 would force internet platforms to install automatic upload filters to scan (and potentially censor) every single piece of content for potential copyright-infringing material. This law does not anticipate the difficult practical questions of how companies can know what is an infringement of copyright. As a result of this big flaw, the law’s most likely result would be the effective shutdown of user-generated content platforms in Europe, since unless companies know what is infringing, we would need to review and remove all sorts of potentially legitimate content if we believe the company may have liability.

The unmistakable impact of both these measures would be an incredible chilling impact over free expression and the sharing of information online, particularly for users in Europe.

Luckily, there are people and organizations in the EU that are fighting against these scary efforts, and they have organized a day of action today, June 12, to raise the alarm.

Julia Reda, a Member of the European Parliament (MEP) who opposes the measure, joined us last week for an AMA on the subject. In it, she offers a number of practical ways that Europeans who care about this issue can get involved. Most importantly, call your MEP and let them know this is important to you!

As a part of their Save the Link campaign, our friends at Open Media have created an easy tool to help you identify and call your MEP.

Here are some things you’ll want to mention on the phone with your MEP’s office:

• Share your name, location and occupation.

• Tell them you oppose Article 11 (the proposal to charge a licensing fee for links) and Article 13 (the proposal to make websites build upload filters to censor content).

• Share why these issues impact you. Has your content ever been taken down because of erroneous copyright complaints? Have you learned something new because of a link that someone shared?

• Even if you reach an answering machine, leave a message—your concern will still be registered.

• Be polite and SAY THANKS! Remember the human.

Phone not your thing? Tweet at your MEP! Anything we can do to get the message across that internet users care about this is important. The vote is expected June 20 or 21, so there is still plenty of time to make our voices heard, but we need to raise them!

And be sure to let us know how it went! Share stories about what your MEP told you in the comments below.

PS If you’re an American and don’t want to miss out on the fun, there is still plenty to do on our side of the pond to save the free and open internet. On June 11, the net neutrality rollback officially went into effect, but the effort to reverse it in Congress is still going strong in the House of Representatives. Go here to learn more and contact your Representative.

Grace VanderWaal

Grace VanderWaal's Tiny Desk Concert is lovely.

Rookie DdRT Error. How not to tie yourself to the top of a tree.

I got stuck up a tree on Sunday. Kinda. I was with somebody who descended and resolved it, but it was a learning-point - particularly when I usually climb alone...

I had ascended with a doubled rope, and then hauled up the tail and dropped it elsewhere to get it out of the way of my climbing partner. The way I did that was to pull up the tail incrementally and allow the taken-up bight to descend down where I wanted it to go. What happens if you do that is you end up holding the free end with the weight of all the slack rope pulling it down. The natural inclination then is to drop it. On this occasion the weight of the rope pulled the end with enough force to cause it to wrap completely around a limb much lower down, leaving it as in the image.

All seemed well until I tried to descend DdRT, when the standing end of the rope would not come up, thus preventing me from descending at all - and preventing me, therefore, from untangling the tail. To compound the problem, the single wrap meant that gravity would pull any slack out of the standing end, essentially acting as a progress-capture device, allowing me only to ascend.

Lessons learned:

• This is why you should climb with a partner. Thanks Jos for descending and unwrapping my rope.

• Don't drop the bight. You are probably ok to allow it to descend until you have the tail-end (though take care! The alternative is to bag the rope as you pull it up...) but then feed the tail down where you want it until all the slack follows it down and is deployed. This takes the energy out of the system, reducing the possibility of wrapping.

• If you do get in this situation, anchor the working end to a limb near you and climb down SRT to unwrap the rope. If you have a throwline with you you can tie a retrievable anchor and not have to climb back up, but if not the extra climb serves you right!

• Climb with a backup system. I always have a hand-jammer and foot-ascender, but I've added a gri-gri to my always-on harness-kit. With the progress-capture effect of this wrap it would have been tricky to tie a munter or super-munter for descending, and that wouldn't have been great for stopping at the wrap anyway.

Stay in school kids!

Parkrun and the NHS

​Parkrun celebrated 70 years of the NHS last Saturday. Lots of people were in scrubs and so on. Nobody beats the person to Kelly's right in this Guardian picture though...!