TED Ed: Derek Muller - The Founder of Veritasium
Did You Know? – 20 Ways of Reusing Silica Gel Packets This annoying little packet has a multitude of household uses. Silica gel is a desiccant, a substance that absorbs moisture. Despite its misleading name, the silicate is actually a very porous mineral with a natural attraction to water molecules. Manufacturers utilize the gel to keep goods from spoiling, molding or degrading due to humidity. The gel itself is nontoxic, but can have a moisture indicator added (cobalt chloride) which is a known toxin that turns pink when hydrated and is otherwise blue in its dry form. Most silica found in our food and household purchases looks like tapioca beads and is benign unless combined with certain chemicals.
How to Walk on Eggs: Fun Physics for Kids Do you ever feel like your kids are “walking on eggshells”? Now you can show your kids how to literally walk on raw eggshells and do something that seems impossible. That’s right, eggs—those delicate things you have to check at the supermarket to make sure they’re not broken. In this article, I’ll show you a fun way to find out whether eggs are truly fragile or are actually incredibly architected pieces of nature, built for both strength and weakness. Why Take the Eggshells Challenge?
SBS: Documentary - Pain, Pus and Poison
To make a Harry Potter-style invisibility cloak requires the use of materials that have what's known as a negative refractive index over all optical wavelengths, from red to violet. However, the artificially-structured optical materials from which cloaks are made thus far have been restricted to a very narrow range of optical wavelengths, limiting their ability to cloak over a range of colors. That obstacle to progress looks to be at an end, as a group of optical engineers at Stanford has succeeded in designing a broadband metamaterial that exhibits a negative refractive index over nearly the entire rainbow. View all The first wide-spectrum optical invisibility cloak - metamaterials
A pear has 600 times more formaldehyde in it than a vaccine does, writes Rachael Dunlop. Image: Oksana Kuzmina/Shutterstock Recently released government figures show levels of childhood vaccination have fallen to dangerously low levels in some areas of Australia, resulting in some corners of the media claiming re-ignition of “the vaccine debate”. You can check how your postcode rates here. Well, scientifically, there’s no debate. Six myths about vaccination – and why they’re wrong (ScienceAlert)
How It's Made
History of Science
Describing and supporting effective science teaching and learning in Australian schools - validation issues
Nature of Science
A Private Universe Project What causes the phases of the Moon? What are the reasons for the seasons? If you ask any number of people questions like these, almost every one of them will have some ideas that make sense to them. But how do people get their ideas? Are their ideas scientifically accurate?