Primitive Technology inches towards the metal age by making an alternative to bellows: a rotary fan driven by a bow. It allows his furnace to get hot enough to extract iron from iron ore, though he’ll need a bigger setup if he wants to get usable amounts of the metal.

RocketJump Film School talks about the importance of movie screenings, where a small group of people watch and critique a “finished” movie before its wide release. If Stanley Kubrick was humble enough to accept others’ opinions of his work, then we should do the same.

Jay Leno’s Garage showcases a beautiful, durable and (more or less) practical hot rod that started out as half of a rotting Model T. But the real gem here is its builder, Clayton Paddison, who has a couple of touching stories about his car. Test drive at 19:33.

Primitive Technology makes building your own home look easy in his latest episode. In fact, it took him 7 days to put it together – five of which were spent gathering grass. Psh. One time we missed winning the lottery by just four numbers.

(PG-13: Language) “Sounds shape what you see and what you think you see.” In film, sound has a unique variant: the ones made by unseen objects or beings. RocketJump Film School points out the various ways that off-screen sound can be used to paint a picture.

Kurzgesagt lists the major breakthroughs that have taken humans to this point. Ultimately, it’s a reminder that we all benefit when we communicate, cooperate, and preserve and share knowledge, not when we deceive, enslave or censor each other.

RocketJump producer Ashim Ahuja talks about the basic process and mindset of budgeting for a film. It’s easy to look at it as a buzzkill, but with enough research and resourcefulness you can make the whole greater than the sum of its parts. Besides, constraints fuel creativity.

Jay Leno checks out Untitled Motorcycles’ barebones variant of Ducati’s entry-level bike. The UMC-038 has been stripped down to its bare essentials, along with a custom tank, seat, rear subframe, a Ducati Monster swingarm and a modded QD box exhaust. Test drive at 11:10.

Jay Leno shows off one of the more interesting cars in his cavernous garage – the Shotwell. Single-handedly built in 1931 by then 17-year-old Bob Shotwell, this three-wheeled vehicle had well over 150,000 mi on it before Jay had it restored. Test drive at 13:52.

Cracked’s devilish salesman Roger returns to talk about cellular phone carriers – a handful of giant corporations that have more or less the same services and efficiency. But look! It’s a map with splotches on it, and there’s a splotch where you live!

Jay Leno shows off his custom made replica of Mercedes-Benz’ one-off workhorse from 1950, a single vehicle Grand Prix race car transporter. Based on the 300 SL gullwing’s 6-cylinder engine, the unique vehicle could originally go up to 108mph.

Kurzgesagt mulls the Ship of Theseus, a paradox that asks whether an object – in this case, the human body – is still the same if you gradually replace all of its parts. And how many of your parts can be removed before you’re no longer you?

Primitive Technology made a yam and sweet potato garden. He said he got the sweet potatoes from “civilization”, but we’re okay with that. If you left us with nothing but sweet potatoes and cargo shorts we’d be dead by sunset.

Colin West McDonald was a Production Assistant (PA) at RocketJump. Here he talks to us about what PAs do with the help of behind-the-scenes footage. PAs are the maids and butlers of the film world, but it’s a great way to learn more about the industry.

Cracked points out the go-to tricks of today’s movie trailers. There’s the overly long title presentation with imposing fonts for action movies, the folk guitar intro for indie movies, and our favorite, the “Transformer losing his boner” sound for epic scenes.

Our smarty pants friends at Kurzgesagt examines the idea of human exploration, and some of the currently known limitations of space travel, physics, and our own bodies which prevent us from traveling to an unfathomable portion of the great unknown.