How menstruation works – Emma Bryce

At this moment, three hundred million women across the planet are experiencing the same thing: a period. The monthly menstrual cycle that gives rise to the period is a reality that most women on Earth will go through in their lives. But why is this cycle so universal? And what makes it a cycle in the first place? Emma Bryce gives a primer on periods.

Lesson by Emma Bryce, animation by Kozmonot Animation Studio.

Don’t Keep Your Hot Water Bottled Up

Two thermometers

Hot water rises because its molecules are moving rapidly as they expand the water.  Hot water is less dense, therefore, the same amount of water takes up the larger space. Hot water rises above the colder denser water.  The resulting movement is called convection.  The flowing displacement of a mass of cold fluid under large amounts of hotter fluid is the same phenomena seen with weather patterns where cold higher pressure air displaces and pushes up the hotter air. Hot air balloons also take advantage of this squeezing action.

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The Four “New” Elements & How We Got Them

The periodic table just got four new elements, but this isn’t as groundbreaking as recent headlines would have you believe. Join Speaking of Chemistry’s resident killjoy to find out why.

Seriously, though, this is some really cool chemistry. We want to thank C&EN’s elemental expert Jyllian Kemsley and chemist/chemical linguist Shawn Burdette of Worcester Polytechnic Institute for their help with this episode.

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And if you want to learn more about these elements, check out these great resources:

Seventh Row Of The Periodic Table Is Now Complete With Addition Of Four Elements | C&EN
http://cen.acs.org/articles/94/web/20…