The Solar System

Where Your Elements Came From

(via APOD; Image Credit: Cmglee (Own work) CC BY-SA 3.0 or GFDL, via Wikimedia Commons )

The hydrogen in your body, present in every molecule of water, came from the Big Bang. There are no other appreciable sources of hydrogen in the universe. The carbon in your body was made by nuclear fusion in the interior of stars, as was the oxygen. Much of the iron in your body was made during supernovas of stars that occurred long ago and far away. The gold in your jewelry was likely made from neutron stars during collisions that may have been visible as short-duration gamma-ray bursts. Elements like phosphorus and copper are present in our bodies in only small amounts but are essential to the functioning of all known life. The featured periodic table is color coded to indicate humanity’s best guess as to the nuclear origin of all known elements. The sites of nuclear creation of some elements, such as copper, are not really well known and are continuing topics of observational and computational research.

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Wildest Dreams (Piano Instrumental)

Credit to Molotov Cocktail

LOL, this whale popped out the ocean like, “Hey, what’s up, hello?!”

P.S. those kayakers are super soaked but totally fine.

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Mug-Ception!

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Blood, Part 1 - True Blood: Crash Course A&P #29

Now that we’ve talked about your blood vessels, we’re going to zoom in a little closer and talk about your blood itself. We’ll start by outlining the basic components of blood – including erythrocytes, leukocytes, platelets, and plasma – as well as the basic process of hemostasis that stops bleeding, and how antigens are responsible for the blood type that you have. By the end of this episode, you should be totally prepared for your next blood drive.

Table of Contents

The Basic Components of Blood 2:30

Erythrocytes, Leukocytes, Platelets, and Plasma 3:00

The Basic Process of Hemostasis 4:45

How Antigens Are Responsible For Your Blood Type 6:21

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