air filter

This Old House's Ross Trethewey explains MERV filter ratings and how air filtration works, then shows how to build a localized DIY air filter, including a box fan with multiple filters.

A University of Michigan Medicine demonstration of building a cheap DIY air purifier from a box fan and a HEPA or high-MERV filter using hardware-store parts. It explains why this helps against dust, smoke and viruses and ties it to local air quality readings.

Rick Hartley's AltiumLive keynote on differential pairs in PC boards. He argues the rules from cables and twisted pairs do not carry over, and covers which pair geometry gives the best impedance control, the right spacing, routing practice and how much skew is acceptable.

Wendover Productions explains how airlines make money from different cabin classes and why premium seats matter so much to profits. It also touches on how this shaped decisions such as the decline of supersonic travel.

The first video in a 55-part series by Michel van Biezen that introduces the Kalman filter and builds from the rationale through algebraic examples to the full matrix treatment. The videos are short, blackboard-style lectures.

David Heinemeier Hansson explains what he learned about indoor air quality after his new house made his family sick. He covers CO2, VOCs, off-gassing, HVAC and ventilation, and cognitive effects, presented at a Basecamp meetup.

An animated account of Day 1 of the Desert Storm air war on 17 January 1991, covering the 2,775 sorties flown against Iraqi strategic targets in the first 24 hours.

A Wendover Productions explainer arguing that major airlines make much of their profit from loyalty programs and co-branded credit cards rather than flying. It frames airlines as quasi-banks that sell points in bulk, using United's pandemic-era loan as a hook.

Louis Rossmann argues that Apple's Independent Repair Program is a PR stunt that misleads the public and burdens independent repair shops. He discusses parts access restrictions and program limits.

A short Kurzgesagt animation explaining the Great Filter, the idea that finding alien life might be bad news because it implies something usually destroys civilizations. It connects the concept to the Fermi paradox.

A Wendover Productions explainer on how airport security is designed, covering screening layers, x-ray scanning, and the contrast with Israel's profiling-based approach. It walks through the logic behind why security works the way it does.

A Wendover Productions explainer on how budget airlines can sell tickets for under 10 euros. It covers the costs airlines face and how low-cost carriers structure their business.

Louis Rossmann argues that reballing flip-chip GPUs is not a real fix for dead laptop GPUs. He explains why such repairs and oven reflow tricks fail and what is actually happening with failing hardware.

Tom Scott visits Penistone to explain the Scunthorpe problem, showing why naive web and profanity filters block innocent words.

A Motherboard documentary episode from Nebraska about farmers and mechanics fighting manufacturers like John Deere over access to the diagnostic software needed to repair modern tractors. It shows how software locks have taken away farmers' traditional self-reliance.

Clay Shirky argues at Web 2.0 Expo NY that the problem online is not information overload but filter failure. He says the real challenge is building better ways to filter and organize what we see.

Researcher Kamal Meattle describes how an arrangement of three common houseplants placed in specific spots can measurably clean the air in a home or office. It is a short TED talk based on his work in a plant-filled building.

An Engineering Giants documentary episode following a British Airways Boeing 747-400 through a D-check, the heaviest maintenance inspection, in Cardiff. The aircraft is stripped down and inspected nearly everywhere.

Adam Conover argues that billionaire philanthropy is harmful, using examples like Patagonia's Yvon Chouinard. He says we should stop accepting the myths about benevolent billionaires.

Hugh Jeffreys tears down the iPhone 13 and assesses its repairability, showing how Apple ties parts like the display and Face ID hardware to specific devices. He demonstrates that swapping parts, even genuine ones, can disable features.

Peter Sripol shows his homemade Part 103 electric airplane flying, built from hobby brushless motors and batteries. The video covers the first flight out of ground effect.

A one-minute clip from Insider showing an Airbus airliner's wings flexing far more than most people expect during a wing load test. It is meant to reassure nervous flyers about turbulence.

Louis Rossmann reacts to lobbyist ads in the Massachusetts right-to-repair ballot fight that suggest repair access would enable domestic abuse and discrimination, and urges support for the campaign.

Hugh Jeffreys tears down the iPhone 12 and assesses its repairability, focusing on how parts are serialized and tied to the device so swapping components between phones does not work.

A comedy song by the Irish duo Foil Arms and Hog about the experience of flying Ryanair, with its many upsells and indignities.

Hugh Jeffreys tests the iPhone 14 Pro and finds that swapping genuine parts between phones disables features, concluding that third-party repair is not really viable despite Apple's Self Service Repair program.

Boeing rehearses its 2015 Paris Air Show flying display of the Vietnam Airlines 787-9 Dreamliner, including a very steep takeoff and tight turns.

Louis Rossmann visits Apple Authorized Service Providers to see what repairs they can actually do. He finds, for example, that an iPhone 6 headphone jack is not repairable and requires an expensive board replacement.

Louis Rossmann examines a 2012 MacBook Pro logic board that Apple refurbished for GPU failures and that failed again. He criticizes the quality of Apple's authorized repair work and argues for right to repair.

A one-minute Rheinmetall promotional demo of Oerlikon Ahead air burst ammunition, which throws a cloud of sub-projectiles to destroy small air targets.

Louis Rossmann criticizes Apple's independent repair provider program as a PR move with invasive contract terms. He argues it does little for independent shops or customers.

A one-minute clip from HBO's Silicon Valley in which Gavin Belson describes the supposed persecution of billionaires in modern America by comparing it to the Holocaust. It is a satirical scene about tech-executive self-pity.

Louis Rossmann's half-hour teardown criticism of the Microsoft Surface Laptop, arguing its soldered SSD and glued construction make it effectively unrepairable. It ties into his right-to-repair advocacy.

A short Conan on TBS segment mocking Apple's new wireless AirPods and the removal of the iPhone 7 headphone jack, in the form of a parody ad.

Vegan advocate Erin Janus explains the dairy industry in about five minutes, covering how milk is produced and the treatment of cows and calves. It is an advocacy piece and includes graphic material.

Matthias Wandel uses anemometer measurements to find where to place a fan to move the most air through a house at night. He finds that placing the fan some distance back from the window works better.

Technology Connections explains why single-hose portable air conditioners are inefficient and often a poor choice compared with window units. It details how the single hose pulls in warm outside air and wastes energy.

Louis Rossmann gives a basic, non-technical introduction to right to repair legislation for people new to the issue.

Tech Ingredients builds a larger solar-powered desiccant air conditioner that uses a calcium chloride liquid desiccant with evaporative cooling to cool their lab. The video includes the engineering calculations.

John Oliver's Last Week Tonight segment covers the working conditions of US air traffic controllers and the understaffing, outdated equipment (including floppy disks) and funding structure of the FAA. It mixes comedy with policy criticism.