Wilhelm Conrad Röentgen, a physics professor at the University of Wurburg in Germany, was experimenting with electric current flow in a partially evacuated glass tube in 1895 and one night he noticed a glow caused by an unknown radiation. He named the phenomenon x-radiation and few months later he took the first x-ray photograph of a body part: the bones in his wife’s hand – and one can even see her wedding band. The first even x-ray image was of a key.

Nitrogen triiodide (NI3) is a contact explosive that sets off whether it comes in contact with a feather or a bug. As shown in the diagram, the chemical is made up of a cluster of three iodine atoms around one side of a nitrogen atom. The result of such a crowd around one atom causes something called bond strain - the atoms repel each other in a small space. The result of this bond strain is that the molecule is prone to falling apart very, causing the mini explosion you see ().

Video link: https://biology-forums.com/index.php?action=gallery;sa=view;id=22482 ...

No, we're not referring to the candy. Humanity has done great!

Here's a more intricate version of the poster above. It was created by professor Peter Alway and was published in the book Rockets of the World:

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You've all experienced the 30-minute test problem. How to tackle it?

With all due respect to essay questions, math, science and engineering students can't tip-toe their way around answers. Test questions are most often multiple choice or free response… and don't let the "free" fool you – there is only one correct answer.

Besides "That test sucked," the most common complaint I've heard exiting the myriad math-based tests I've taken over the years is, "You know that long problem at the end? I didn't even know where to start. SO unfair."

I think what's really unfair is that person's right to use the same language as the rest of us… but I digress.

Truth be told, it's safe to say we've all had our trying times with lengthy, intricate word problems w ...

Is creation a viable model of origins in today's modern, scientific era? Leading creation apologist and bestselling Christian author Ken Ham is joined at the Creation Museum by Emmy Award-winning science educator and CEO of the Planetary Society Bill Nye.

Dead or depleted batteries, especially cylindrical ones like AA or AAA batteries, can exhibit a unique behavior known as "bouncing" when dropped from a short height. This phenomenon is primarily due to changes in the battery's internal chemistry and physical properties as it becomes discharged.

Inside a battery, there are chemical reactions that generate electrical energy. As a battery discharges and its chemical energy is depleted, its internal chemistry changes. One of the changes that occur is a reduction in the pressure of gases within the battery. This decrease in gas pressure can make the battery feel lighter, contributing to its bounce.

As a battery discharges, its internal components, such as the cathode, anode, and electrolyte, unde ...