The Boing Boing tv crew is taking this end-of-summer week off from production, so we're revisiting some of our favorite episodes from the last couple of months -- fun stuff you may have missed.

Today: John Behrens and "Omega Recoil" build giant Tesla Coils. Their work explores how electronic fields can be excited in the environment, and their creations become the centerpieces of interactive public art performances.

Some of the tinkerers and performers in this SF Bay Area-based collective were previously associated with Dr. Megavolt, an electrical art project which...

[featured] a person in a metal mesh suit interacting with artificially generated lighting. The Doctor sets objects on fire with electricity originating from large Tesla coils, spars with the electric arcs and exhorts the audience to worship the elemental force of electricity.

Boing Boing tv's retro-tech correspondent Todd Lappin of Telstar Logistics submerges us in WWII history on the supersized submarine USS Pampanito.

This Balao-class ship was built in 1943, and today one of her younger volunteer caretakers schools us on all the gadgets, gizmos, and old-school technology that kept this baby cruising to Pearl Harbor and back.

Did you know that subs like this couldn't submerge for more than 24 hours back then, because they'd run out of battery life? Think of it like this, Gen-Y-ers, that's like when your iPhone 3G slides into "red" mode, because you've been twittering too much. Only with people inside. And big guns to shoot bad guys.

Pampanito trivia: she's named after this little fishie, prized as a seafood delicacy. Wait, a sushi ingredient? Doesn't sound like a great idea for a WWII military ship!

Shot for BBtv by Eddie Codel, during the Long Now Foundation's Mechanicrawl.

Previously on BBtv:

* Multi-millenial Mechanical clocks (Long Now Mechanicrawl pt. 1)
* WWII Boatpunk: Aboard the SS Jeremiah O'Brien, with Todd Lappin (pt. 2)

PS: extra-special thanks to Scott Beale of Laughing Squid for hooking BBtv up with Eddie Codel!

In this final installment of our TCHO Chocolate trilogy, Xeni and Pesco go on a magical mystery taste test tour -- think Willy Wonka meets The Trip. Former NASA software developer Timothy Childs founded the tech-minded chocolate company, and was joined by WIRED co-founder Louis Rosetto.

In previous BBtv episodes we learned about the hacked-together, home-tinkered machines and high-tech wizardry that keep their factory humming. Today we dive in to the genetics of chocolate plants, and the hedonics -- the tasting experience -- of the finished product, where science meets sensuality meets sugar.

Oh hell, who are we kidding, you guys? We sat around and GOT HIGH on neuroactive cocoa alkaloids. We freebased theobromine and we LIKED IT. We liked it a LOT.

Warning: this episode is NSFC (not safe for chocoholics).

Previously on Boing Boing tv:
* TCHO, part 1: chocolate origins.
* TCHO, part 2: magical machines, mysterious molecules.

Related: read a feature about TCHO by David Pescovitz in the current issue of MAKE Magazine, Timothy and the Chocolate Factory.

Here are some iPhone snapshots from Xeni on Flickr: TCHO, Boing Boing tv.

(Special thanks to Amy Critchett, and Wayne & Breanna)

BBtv guest correspondent and blog pal Todd Lappin of Telstar Logistics takes us inside a steam-powered World War II "Liberty Ship," the SS Jeremiah O'Brien.

We marvel (!) at the cool old retro-technology that kept this behemoth boat running to and from the beaches of Normandy, and we meet the volunteer caretakers -- obsessive nerds just like us, only with white hair! -- who keep her ship-shape today. Did you know that shipyards in the San Francisco Bay Area once churned out Liberty Ships like this in 4 days or less, during the heat of the war? Watch and learn, li'l skippers.

Todd has a rockin' photoset of images from the ship, too.

Shot for BBtv by Eddie Codel, during the Long Now Foundation's Mechanicrawl.

Previously: Multi-millenial Mechanical clocks - Long Now "Mechanicrawl" pt. 1

Boing Boing tv guest correspondent Todd Lappin (R) and cameraninja Eddie Codel (L) trek to the Long Now Foundation's first-ever Mechanicrawl event, and bring back tales of early analog computing, fantastic timepieces, and impossibly eccentric mechanical things.

First, Todd speaks with the Long Now Foundation's Alexander Rose about a 10,000-year mechanical clock dreamed up by supercomputer designer Danny Hillis.

Next, we listen to a prototype chime mechanism that will ring ten bells in a different sequence each day over the next 10,000 years. Brian Eno and Danny Hillis came up with the algorithm, and a team of tinkerers crafted the contraption to tap out time on a series of Tibetan bowl gongs.

Todd has a photoset with snapshots from the Mechanicrawl adventures. See also this previous Laughing Squid post.

(Special thanks to Karen Marcelo for image shown in video still)

The 1982 cyberpunk cinema classic Blade Runner remains one of the most influential science fiction movies of all time, and tops many a nerd's favorite films list.

Today on Boing Boing tv, Boing Boing Gadgets editor Joel Johnson visits the studio of artist and futurist Syd Mead, who designed the film's dystopian look and feel. We learn about the "erotic machine" he dreamed for the replicant Zhora (this breast-shaped dreampod was cut from the script when director Ridley Scott ran out of dough), the 1 2 3 *4* alternate opening scenes designed by Syd (one of them, which involved shoveling dead bodies, was deemed "too Holocaust"), what really lights up those building facades, and many more secrets.

Syd explains he envisioned the world of Blade Runner as a place "you wouldn't want to be for too long," and describes the challenges of designing for "a love story with moralistic underpinnings... if we could actually make people, would we treat them like dishwashers? Just use them up and throw them away?"

If you like this episode, you might want to pick up:

BLADE RUNNER: THE FINAL CUT [Amazon]

VISUAL FUTURIST: The Art & Life of Syd Mead DVD [sydmead.com]

And more Syd Mead books on Amazon.

Previous episodes in BBtv's Syd Mead trilogy:

Joel Johnson interviews Syd Mead: part 1.

Joel Johnson interviews Syd Mead: part 2.

(Footage from the movie Blade Runner courtesy Warner Bros. Entertainment / Warner Home Video; Artwork courtesy of Syd Mead Inc.)

Today on Boing Boing tv, Xeni and Pesco dive deeper into the magical chocolate factory founded by a NASA software developer.

In this installment of BBtv's 3-part series on TCHO Chocolate, we learn more about the hacked-together, home-tinkered machines and high-tech wizardry that keep the factory running. The philosophy is "scrappy, not crappy," as founder Timothy Childs explains.

TCHO's R&D lab contains such diverse components as Space Shuttle tape, a modded RONCO turkey oven, stone grinders used in Indian restaurants, and deconstructed space heater parts from the local hardware store.

Next, we zoom in to the molecular-level science behind this most delicious confection. Science buffs, rejoice! This episode is as fun for your eyes and brain as the "obsessively good" chocolate is for your mouth -- Polymorph fun for the whole family. Warning: this episode is NSFC (not safe for chocoholics).

Previously on Boing Boing tv:
* TCHO, part 1: chocolate origins.

Related: read a feature about TCHO by David Pescovitz in the current issue of MAKE Magazine, Timothy and the Chocolate Factory.

Here are some iPhone snapshots from Xeni on Flickr: TCHO, Boing Boing tv.

(Special thanks to Amy Critchett, and Wayne & Breanna)

Today on Boing Boing tv, a music video for the Pinker Tones song "S.E.X.Y. R.O.B.O.T." produced by Bill Barminski's "Walter Robot" studio. The whole album ("Wild Animals") is great: Amazon link, iTunes.

Previous BBtv episodes featuring Walter Robot Studios and Bill Barminski:

Bill Barminski animation: "Drive-In"

Mark makes a mini amp / Funky cowboy (BBtv's 50th!)

Roachbot / Walter Robot

Xeni and Pesco visit TCHO, a homebrew chocolate technology startup hacked together by a space shuttle technologist, Timothy Childs, and the founder of Wired, Louis Rosetto.

In part one of BBtv's multi-part exploration of Tcho, we begin in the lab, and learn about the origins of chocolate: it's a weird looking fruit with biological roots in faraway tropical lands. How this fruit is cultivated, harvested, and cured determines the flavor of the final product, and we learn about the hedonics -- the sensual nuances -- of this exotic and temperamental element.

Related: read a feature about TCHO by David Pescovitz in the current issue of MAKE Magazine, Timothy and the Chocolate Factory.

Here are some iPhone snapshots from Xeni on Flickr: TCHO, Boing Boing tv.

(Special thanks to Amy Critchett, and Wayne & Breanna)

(Update: By total coincidental timing, the VA executive featured in this episode, Charles Ogilvie, announced today he's moving on from VA to do something that sounds equally cool with tech and entertainment. Details at the bottom of the post.)

[Xeni Jardin]: Last week, the Boing Boing tv crew was in San Francisco shooting a few upcoming episodes, and our friends at Virgin America (BBtv is shown on the in-flight entertainment system) invited us to come wander around behind security, and peek at the nuts and bolts that are the tech underpinnings of this airline.

They're about to launch in-flight wireless internet soon, and they're holding a competition for open source games, the winners of which will be available for people to play in-flight (entries are still being accepted).

Virgin America's head of in-flight entertainment, Charles Ogilvie, brought us on board a plane that was empty and at rest between flights. We poked around with the computers and displays (all Linux!) and we tried to IM our friends using the pilot's controls in the cockpit. This did not work so well.

My favorite part of this shoot: driving a VA pickup truck around between the resting airplanes, and peeking into the giant abyss where your bags are shuffled around on giant conveyor belt systems, hopefully towards your plane and final destination.

(Disclaimers: BBtv is an in-flight entertainment partner with Virgin, but BBtv doesn't receive compensation for this. VA once asked Boing Boing to name a plane, and we did, but we weren't paid for this, either. VA has previously been a paid sponsor on Boing Boing the blog. This episode isn't an ad, and we weren't paid to produce it. All of us at BBtv sincerely thought this stuff was cool, and that Charles Ogilvie is a cool guy with interesting ideas, and we had a blast goofing around where the TSA folks generally do not permit one to goof. )

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Update, 07-03-08: BBtv learned today that Charles Ogilvie is moving on from Virgin America. We're bummed we won't be working with him there anymore! The timing of this episode and his move are totally coincidental, we weren't aware. Here's the note from VA CEO David Cush, after the jump, and congrats on your next adventures, Charles!

Music legend David Byrne transforms an entire NYC building into a giant musical instrument, and Xeni joins him inside for a BBtv tour.

Playing the Building is Byrne's latest sonic innovation, and morphs the century-old Battery Maritime Building into a clanging, vibrating sound sculpture. In this installation, the former Talking Heads co-founder blurs the boundaries between the creators and consumers of culture. He explains:

Devices [have been] attached to the building's structure — to the metal beams and pillars, the heating pipes, the water pipes — and are used to make these things produce sound. The activations are of three types: wind, vibration, striking. The devices cause the building elements to vibrate, resonate and oscillate so that the building itself becomes a very large musical instrument.

Byrne sees music as deeply embedded within the natural sounds that surround us every day, and believes "anyone can be a writer, artist, or musician if they want to."

Playing the Building continues through August 10, 2008 at 10 South Street, New York, NY; open every Friday through Sunday, noon - 6pm. Admission is free of charge.

(Photos used in this episode: Clayton Cubitt. Special thanks to Danielle Spencer, and Jason Wishnow).

Update: Byrne will receive a lifetime achievement award at the Webby Awards tonight.

BB co-founder and Make editor in chief Mark Frauenfelder talks to robot builder Daniel O'Connell about his experiment in the uncanny valley, a tricycle-riding mini-me he calls "My Dummy." Shot at Maker Faire Bay Area 2008.

Today on Boing Boing tv, Xeni visits TechShop, an open-access public workshop that's kind of like a health club with heavy machinery and sparks instead of treadmills. Tinkerers, inventors, and hackers pay a membership fee, and in turn receive access to professionally-maintained gear, workshops, mentors, and a community of like-minded makers.

Currently there is only one site in Silicon Valley, and it opened in 2006. But founder Jim Newton (a lifetime maker, veteran BattleBots builder and former MythBuster) plans to open a number of locations around the US -- and eventually, the rest of the world.

John Todd, who you'll meet in this episode, wrote this article about the membership-based machine and fabrication shop in a recent edition of Kevin Kelly's Cool Tools zine. Snip:

I've been a member since before TechShop really even started, back when it was just some guys passing out flyers trying to gauge interest. For $100 a month, members can use any tool in the shop on which they've received training. MUCH cheaper than buying your own gear. The list of equipment is pretty extensive, too, and new items are arriving frequently (like a new hot-wire foam cutter).

John shares an additional note with BBtv about the company's business model:

TechShop is unusual in the way it's funded - community members are the financial backers. To date, TechShop has been funded by taking loans from members and repaying them at a nominal rate. Typically backers contribute $25k and up, and are then paid back over several years. There is an "A" round being raised now to fund the nationwide expansion, and the first funding source again is going to be the community instead of focusing on traditional VC sources. It's an unusual way to keep members excited about what they do at TechShop, and to keep them focused on making the whole experience better. Jim Newton (CEO) and Mark Hatch (COO) are looking for additional interested people who want to become members and funders - contact TechShop for details.

In part two of today's episode, we take a joyride in a three-wheeled electric car.

At the 2008 Bent Festival for experimental electronic music, Xeni encounters Krach der Roboter ("Noise Robot"), who brings a message of peace, crackers, and chaotic tonal algorithms for all mankind.

"Why do humans love robots so much?" Xeni asks. "Actually, people love animals, babies, and robots," Krach replied. "But animals make turds and babies cry, while robots do none of those things."

Includes gratuitous references to the spectacularly crappy 1979 movie "Starcrash," starring David Hasselhoff and Christopher Plummer. Special thanks to Make, which sponsored the event, and to Andreas Stoiber and Johannes Grenzfurthner of monochrom.

MORE circuit bending video goodness: filmmaker John Fox attended the 2007 Bent Festival in Los Angeles, and shot this fun mini-documentary about the instruments, the technology, and the participants: Video Link.