Environmental scientist David Keith proposes a cheap, effective, shocking means to address climate change: What if we injected a huge cloud of ash into the atmosphere to deflect sunlight and heat?

As we recklessly warm the planet by pumping greenhouse gases into the atmosphere, some industrial emissions also produce particles that reflect sunshine back into space, putting a check on global warming that we're only starting to...

Learn the basics about testing for negative ions. Which methods and techniques are used to test negative ions? Find out more in this video!

NASA’s Mars 2020 rover will sport a rock-vaporizing laser gun

Learn the basics about testing for negative ions. Which methods and techniques are used to test negative ions? Find out more in this video!

What common minerals are included in the carbonate, sulfate, and phospate classes? What geological and weather conditions are conducive to the formation of these mineral rocks? And what is a mineraloid?



The 8 Classes of...

The video provides a detailed explanation of how to prepare a pure dry sample of an insoluble salt, specifically lead sulfate. The speaker first explains the solubility rules that determine whether a salt is soluble or not. Then, he goes...

This video explains the properties and uses of sulfur, an element that has been known since ancient times. They discuss its yellow crystal and powder forms, its role in the production of sulfuric acid and fertilizers, its use in cleaning...