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Hello, my name is Jerry, and I’m from North London. I wouldn’t describe myself as a science nerd, but I am deeply fascinated by how the human body works and how science and technology can help us better understand ourselves. I’m especially interested in the future of mental health, human development, and the possibility of creating tools that help people build greater self-awareness, resilience, and mastery over their own lives. I’m currently exploring several ideas that combine emerging technology with human wellbeing. They’re still in the experimental stage, but I’m passionate about turning these concepts into something that could make a meaningful difference. I’m always open to connecting with scientists, researchers, engineers, entrepreneurs, and curious minds who enjoy discussing bold ideas. If there’s an opportunity to collaborate, share knowledge, or help bring these visions closer to reality, I’d be delighted to connect and see where the conversation leads.

Yesterday we shared a video that showed talked about a Chinese innovation that created a highly efficient thermoacoustzic Sterling engines that could have applications in Space flight and beyond. Today I thought I share the secret of how you can make your own thermoacoustzic Sterling engine at home. It's actually quite simple! For those who want a serious application to generate your own energy, check out the second video below. Enjoy.

Underwater shadows shouldn't do this. A leaf floating flat on a pool casts a plain gray blob — until the water gets a bit deeper, and suddenly its shadow sprouts a glowing white rim, as if lit from below. Drag a hairbrush through your bathtub, pull it out, and dark rings with luminous edges keep swirling on the tub floor for minutes after — nothing is even there anymore. Poke a pencil into a basin at an angle and its shadow splits into two fat "sausages" with a bright gap between them, like the pencil is casting two shadows of itself. None of this is a trick of the eye. As detailed in this delightful article from The Amateur Scientist by the great Jearl Walker, it is refraction, and it is stalking you in ordinary bathwater. A floating razor blade dents the water surface just enough to bend light into razor-sharp focal lines called caustics — the same optics that paint the wavering bright net you see on a pool floor, or the ring inside a coffee cup on a sunny table. Depending on the water's depth to the millimeter, that blade's shadow can be smaller than the blade, bigger than the blade, ringed in light, or perfectly normal. A vortex left behind by your hand has a paraboloid core wrapped in a hyperboloid skirt, and the article works out — with a drinking straw, a stack of razor blades, and a sheet of paper you can raise and lower — exactly which rays are responsible for which bright line. The best part: every experiment described uses nothing but a bathtub, a razor blade, a pencil, a straw, and a lamp. It's a full afternoon of DIY physics that ends with you being able to predict, and then produce on command, effects that most people go a lifetime writing off as "weird stuff." If you've ever wondered why your own shadow in a pool looks a little off, this is the article that explains it — read it before your next bath.