How Counterflow Heat Exchangers Work — And Why They Seem to Break Physics
Cold water ends up hotter than the hot water. Sounds impossible, but counterflow heat exchangers do it every day — in your boiler, your kidneys, and a duck's legs.
Topic
diy
5 articles
Turn a Jailbroken Echo Show 5 into a Home Assistant Bedside Display
A $100 refurbished Echo Show 5 with Lineage OS and View Assist makes a surprisingly capable bedside Home Assistant display — no subscriptions, no Amazon.
microRacer ESP32 Kit: 5 Upgrades That Make This Open-Source Mini Car Even Better
The microRacer — a hackable ESP32-powered mini RC car — just got 5 big upgrades: RGB LEDs, better steering, direct USB programming, a protected battery enclosure, and custom injection-molded tires.
Superwood: The Wood That's Stronger Than Steel — And It's Almost Here
InventWood is getting ready to sell superwood commercially. Here's how it's made, how it holds up to termites and water, and what it actually costs.
Use Any Controller on Any Console with a $4 Raspberry Pi Pico and OGX Mini
Turn mismatched wired controllers into a cross-platform adapter for PS3, Switch, and Xbox using a $4 Raspberry Pi Pico and free OGX Mini firmware.