Charcoal is a valuable fuel that reaches a higher temperature than the very wood it’s made from. I’ve made some before, but with supplies running low due to furnace experiments, I decided to make another large batch of charcoal in a mound. I stacked the wood into a roughly conical shape (about 1 m wide and 75 cm high) and then built a thick wall of mud around the heap (this took 6 hours). Eight air entries were made in the base of the mound and one air exit hole was left at the top of the mound to allow the volatile components of the wood to escape while creating a natural draft to keep everything burning. (read more)
Former NASA engineer Mark Rober created a customized set of horns for his car that play three different sounds. The main horn is a friendly honk that lets off two quick chirps for non-emergency situations, the next is a loud train horn for getting everyone’s attention, and finally a super friendly R2-D2 beep sound.
This horn is SO courteous my car was granted Canadian citizenship yesterday. I customized my car horn to play three different sounds. The main sound is the “Courtesy Honk” which is used to get the attention of other drivers in a non-emergency scenario. It’s two quick chirps of the horn that is not only friendly sounding, but it’s not as loud as a normal car horn.
Aaron and Davis of Hacker House used an Arduino to build an autonomous cooler that follows you wherever you may go. The Bluetooth, “follow me” cooler connects to a smartphone and uses GPS to move around. In-depth instructions on how they built the marvelous cooler is available to view on Hackster.io.
submitted via Laughing Squid Tips