Lifeboat Foundation

For one month Rob Greenfield lived just like the average person and WORE every single piece of trash he created. Why? To create a visual of how much trash just one of us creates and serve as a mirror to society to self-reflect, question habits and explore alternatives to live in balance with Earth.

Rob Greenfield is an activist and humanitarian dedicated to leading the way to a more sustainable and just world. He embarks on extreme projects to bring attention to important global issues and inspire positive change. His work has been covered by media worldwide including National Geographic and he’s been named “The Robin Hood of modern times” by France 2 TV. This talk was given at a TEDx event using the TED conference format but independently organized by a local community.

A new model suggests that lattice defects are responsible for the way some semiconductors become harder under illumination.

Understanding how semiconductors respond to illumination has been crucial to the development of photovoltaics and optical sensors. But some light-induced behaviors have been less thoroughly investigated. For example, when some semiconductors are illuminated, their mechanical properties can change drastically, a phenomenon known as photoelasticity. Photoelastic materials could be useful in the development of flexible electronics, but researchers do not understand in detail the mechanism behind the effect. Now, based on experiments and simulations, Rafael Jaramillo of the Massachusetts Institute of Technology and colleagues present a new theoretical framework that explains photoelasticity in terms of lattice defects [1].

The researchers used a diamond-tipped probe to make nanometer-scale indentations in samples of zinc oxide, zinc sulfide, and cadmium sulfide—first in the dark, and then under a range of visible and ultraviolet wavelengths. All three materials hardened to varying degrees when illuminated, with cadmium sulfide showing the largest and most consistent response. For every sample, the effect increased as the photon energy increased toward the material’s band gap.

More on Tesla’s new battery tech.

Cory and Antonio overview Tesla’s improved cell interconnects, current collector layout, voltage sensor harness (VSH), and battery management system (BMS) of the 4,680 structural pack.

Continue reading “Tesla’s 4680 Current Collector Layout” »

Steerable arm helps save energy while capturing panoramic views.

A water-activated disposable paper battery is presented in a proof-of-principle study in Scientific Reports. The authors suggest that it could be used to power a wide range of low-power, single-use disposable electronics—such as smart labels for tracking objects, environmental sensors and medical diagnostic devices—and minimize their environmental impact.

The battery, devised by Gustav Nyström and colleagues, is made of at least one cell measuring one centimeter squared and consisting of three inks printed onto a rectangular strip of paper. Sodium chloride salt is dispersed throughout the strip of paper and one of its shorter ends has been dipped in wax. An ink containing graphite flakes, which acts as the positive end of the battery (cathode), is printed onto one of the flat sides of the paper while an ink containing zinc powder, which acts as the negative end of the battery (anode), is printed onto the reverse side of the paper. Additionally, an ink containing graphite flakes and carbon black is printed on both sides of the paper, on top of the other two inks. This ink connects the positive and negative ends of the battery to two wires, which are located at the wax-dipped end of the paper.

When a small amount of water is added, the salts within the paper dissolve and charged ions are released. These ions activate the battery by dispersing through the paper, resulting in zinc in the ink at the negative end of the battery releasing electrons. Attaching the wires to an electrical device closes the circuit so that electrons can be transferred from the negative end—via the graphite and carbon black-containing ink, wires and device—to the positive end (the graphite-containing ink) where they are transferred to oxygen in the surrounding air. These reactions generate an electrical current that can be used to power the device.

Researchers have found a way to use chaos to help develop digital fingerprints for electronic devices that may be unique enough to foil even the most sophisticated hackers.

Just how unique are these fingerprints? The researchers believe it would take longer than the lifetime of the universe to test for every possible combination available.

“In our system, chaos is very, very good,” said Daniel Gauthier, senior author of the study and professor of physics at The Ohio State University.

Gen-Z users of social media are flocking to new more visual sites like Twitch. TV, Discord, BeReal, and Poparazzi.

A new division of Science X Network, covers the latest engineering, electronics and technology advances.

Harnessing muons allows us to see through and inside objects to uncover their secrets.

A muon beam discovered a previously unknown room deep inside the Great Pyramid at Giza. Now DARPA wants to build muon beam imagers.