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I've been searching for a second-hand overhead projector on Gumtree (AU) for months. I'm still hopeful that I will find one, but this searching often leads me to find other good things on Gumtree. Over the weekend I picked up this bike (below) for $50 including the child seat and bike lock (it needs a new chain), and the Montessori Dino Cards for $10. Where do you look for good Montessori second-hand finds, FB marketplace, Gumtree, FreeCycle? The key to getting a bargain on Gumtree is finding items that you need and that are located close to you. Here are...

Amazon Canada has awesome March Break Deals available now! Amazon Canada has great Deals of The Day, with new deals every day. Also, Amazon Canada has more great deals that include: Get Greenworks Pro 2700 PSI 1.2-Gallon-GPM 14 Amp Cold Water Electric Pressure Washer, for $263.71, Save 32% off Get Rogue 365 Natural Gas Grill with Range Side Burner, Black, for $585.65, Save 31% off Get Betbo Bidet Toilet Attachment 620 Self-Cleaning Bidet Sprayer for Fresh Water Non-Electric Bidet Sprayer for Toilet, for $33.97, Save 21% off Get Betbo bidet Attachment for Toilet 685 Self Cleaning Dual Nozzle Bidet Sprayer for Fresh...

Introduction Shared micro-mobility has gained increasing popularity in recent years. This new transportation (including bikes and scooters, etc.) is convenient, fun, healthy, and good for the environment. According to a study from the National Renewable Energy Laboratory in 2021, high adoption of shared micro-mobility can save 2.3 billion gasoline-equivalent gallons per year nationwide [1]. The US micro-mobility market size was at 192 million USD in 2021 and is expected to surpass 217 million USD by 2025 [2]. Seven years after its May 2013 launch in New York City, Citi Bike, the nation’s biggest bike share system, reached the milestone of...

There are a few classic physics problems that it can really help to have a mental map of. One is, of course, wave propagation. From big-wave surfing, through loudspeaker positioning, to quantum mechanics, having an intuition for the basic dynamics of constructive and destructive interference is key. Total energy of a system, and how it splits and trades between kinetic and potential, is another. We were talking about using a bike generator to recharge batteries on the Podcast last night, and we stumbled on a classic impedance mismatch situation. A pedaling person can put out 100 W, and a cell...

Hey there! Happy Saturday from a sunny and soon-to-be 62º F day (depending on when you read this). Woo-hoo.  Spring is on the horizon! The week flew by, but it wasn’t too shabby. It started with a coffee date with a local friend that I hadn’t seen since January. I met Jane at WW a couple of years back, and we’ve been Rogersville buddies ever since. She and her husband have been on a roller coaster of emotions with COVID and a slew of other unexpected scares with health. Her husband was in the hospital for 66 days with COVID....