Life grew as a result of natural processes that used Earth's raw materials.
Models of life's origins almost always look to minerals for such essential tasks as the synthesis of life's molecular building blocks or the supply of metabolic energy, but this assumes that the mineral species found on Earth today are much the same as they were during Earth's first 550 million years — the Hadean Eon — when life emerged.
A new analysis of Hadean mineralogy
published in American Journal of Science
Edward Snowden: patriot or traitor? Whatever your opinion of Mr. Snowden, he did give us pause to reflect on our Fourth Amendment rights “of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized.” When contemplating the problem, one must first answer why the Fourth Amendment was considered so important that it needed to be added to the Bill of Rights.
While driving to my doctor's office to get some persistent Toxicodendron diversilobum (that's poison oak) looked at, I listened to NPR. Just as you would expect of me, my radio stations will all have buttons for NPR, country music, whatever station carries Rush Limbaugh, and a variety of others. On NPR I was intrigued because the guest chef was preparing a meal for alternative Thanksgiving lifestyles, that being vegan and gluten-free.
Some older chemistry sets included a conductivity tester to demonstrate the conductivity of materials and liquids. If you wish to include Snap Circuits in your Science Play and Research Kit you can use a simple circuit designed with the 555 timer IC incorporated into the circuit to test conductivity. For an introduction to the 555 timer IC and snap circuits, please review this article
1 555 Timer IC
1 250 ml beaker
Snap Circuits Parts:
You may wish to include a UV LED in your Science Play and Research Kit. Nowadays you can find inexpensive key chain lights that include a visible light LED flashlight, but also include a red laser LED and UV LED. The red laser can be used to demonstrate the Tyndall effect, and the UV LED can be used to demonstrate a lot of stuff that becomes visible under UV light. I found this black light (UV) LED strobe light on clearance after Halloween for around $2.00 USD:
You can use a laser to demonstrate the Tyndall effect. A simple cat toy (laser pointer) will do but for this demonstration I’ll be using the laser from my DIY Laser Interferometer
. “The Tyndall effect, also known as Tyndall scattering,” according to Wikipedia
, “is light scattering by particles in a colloid or particles in a fine suspension.” You can use the laser to test three different mixtures: solutions, colloids, and suspensions.
250 ml beaker
Table salt (NaCl)
Dirt from your garden
You often see demonstrations of titration using an expensive glass burette, but you can build titration lab ware using a disposable serological pipette, a solder sucker bulb, and a ring stand or support stand. For this build I’m using my erector set support stand (I sometimes call it my Bunsen burner stand). Titration is the process of determining the unknown concentration of a solution by adding a known amount of a solution with a known concentration. For example, in an acid-base titration, you can determine the unknown concentration of an acid in a solution by adding a base solution of known concentration.
Tiny self-assembling transport networks, powered by nano-scale motors and controlled by DNA, have been developed. And the system can construct its own network of tracks spanning tens of micrometers in length, transport cargo across the network and even dismantle the tracks.
Researchers were inspired by the melanophore, used by fish cells to control their color. Tracks in the network all come from a central point, like the spokes of a bicycle wheel. Motor proteins transport pigment around the network, either concentrating it in the center or spreading it throughout the network. Concentrating pigment in the center makes the cells lighter, as the surrounding space is left empty and transparent.
Bisphenol A (BPA) in high quantity can harm people, just like almost anything. BPA has been labeled a concern by some because of its ability to be an endocrine disruptor that hijacks the normal responses of hormones.
While toxicology studies have shown that only very high doses of this chemical affect exposed animals — doses as high as 50 mg/kg/day - by focusing on numerous endpoints a new review says it can find effects not detected in peer-reviewed toxicology studies. The authors of a new paper conclude that endocrine disruptors need to be studied at much lower doses.
In Part 2 of Science Play and Research Kit: Business Models, Packaging, and Marketing, we’ll discuss the Gillette Razor model. I’m sure you’ve heard of it: give the razor away and sell the blades. It would seem that this model is more myth
than reality. There isn’t much in a science kit that you can actually patent and if you’ve bought in to open design from SPARK Part 1
patents would be an anathema to open design and science outreach.