Collaborate Disseminate
If you’re worried that [Roman Dvořák]’s spectroscopic analysis of fireworks is going to ruin New Year’s Eve or the Fourth of July, relax — the science of this build only …read more Continue reading Seeing Fireworks in a Different Light
Lasers are known for the monochromatic nature of their light, so much so that you might never have thought there could be such a thing as a white laser. But …read more Continue reading A White-Light Laser, On the Cheap
Hackaday editors Elliot Williams and Mike Szczys flip through the index of great hacks. This week we learn of a co-existence attack on WiFi and Bluetooth radios called Spectra. The craftsmanship in a pneumatic drone is so awesome we don’t care that it doesn’t fly. Building a powerful TEA laser …read more
This year, at DEF CON 28 DEF CON Safe Mode, security researchers [Jiska Classen] and [Francesco Gringoli] gave a talk about inter-chip privilege escalation using wireless coexistence mechanisms. The title is catchy, sure, but what exactly is this about?
To understand this security flaw, or group of security flaws, we …read more
Continue reading Separation Between WiFi and Bluetooth Broken by the Spectra Co-Existence Attack
One of the vast untapped potentials of medicine is the access to imaging equipment. A billion people have difficulty getting access to an x-ray, and that says nothing about access to MRIs or CAT scans. Over the past few years, [Jean Rintoul] has been working on a low-cost way to …read more
Continue reading Tomography Through An Infinite Grid Of Resistors
More often than you think, scientific progress starts with a simple statement: “Huh, that’s funny…” That’s the sign that someone has noticed something peculiar, and that’s the raw fuel of science because it often takes the scientist down interesting rabbit holes that sometimes lead to insights into the way the world works.
[Ben Krasnow] ended up falling down one of those rabbit holes recently with his experiments with magnets and flames. It started with his look at the Zeeman effect, which is the observation that magnetic fields can influence the spectral lines of light emitted by certain sources. In a …read more
Vera sat hunched in the alcove at Kitt Peak observatory, poring over punch cards. The data was the same as it had been at Lowell, at Palomar, and every other telescope she’d peered through in her feverish race to collect the orbital velocities of stars in Andromeda. Although the data was perfectly clear, the problem it posed was puzzling. If the stars at the edges of spiral galaxy were moving as fast as the ones in the center, but the pull of gravity was weaker, how did they keep from flying off? The only possible answer was that Andromeda contained …read more