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What is ”egg-shaped” even? I used to think it was the shape of a chicken egg. Then one day I saw a collection of eggs from lots of different bird species, and I realized just how many different kind of egg shapes there really are! I had to know why. And it turns out a couple teams of scientists had wondered the same thing. Here’s what science says about why eggs are egg-shaped, if that's even a thing, which I’ve learned it might not be. Evolution of bird eggs, go!
#egg #biophysics #eggvolution

References: https://sites.google.com/view/....why-are-eggs-egg-sha

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This organic chemistry video tutorial provides a basic introduction into the diels alder reaction which is a 4 + 2 cycloaddition reaction. it discusses the reactivity of the diene and dienophile with the use of electron donating groups and electron withdrawing groups. It discusses the formation of bicyclic compounds using the diels alder reaction as well as the stereochemistry of the products. The endo product is usually the major product of this reaction compared to the exo product. This video contains plenty of examples and practice problems.

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Arrow of Time FAQ: http://preposterousuniverse.co....m/eternitytohere/faq

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Sean Carroll's TED talk on time and the multiverse: http://www.ted.com/talks/sean_....carroll_distant_time

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WEBSITE: http://www.teachertube.com Standard to Scientific Notation

WEBSITE: http://www.teachertube.com 8th grade teacher Lamar Queen rapping about slopeintercept to students
I got this video from youtube.

WEBSITE: http://www.teachertube.com How do you determine the two triangles when you have the SSA case?

This math video tutorial shows you how to convert decimals to fractions in simplest form.
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WEBSITE: http://www.teachertube.com In this screencast I show students how to solve an area problem for a complex figure

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Robert Liston: the surgeon with a 300% mortality rate
How did this man, a world-renowned doctor at the cutting edge of nineteenth-century medicine, come to be the only surgeon with a 300% mortality rate? The statistic is taken from one of his surgeries, which began much like any other day for Liston.

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Created by Daniel Turner (B.A. (Hons) in History, University College London)
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Sources

Books
Robert Liston, Practical Surgery (London, 1837)

Articles
Bill Thomas, ‘Saints and sinners: Robert Liston’, THE ROYAL COLLEGE OF SURGEONS OF ENGLAND BULLETIN, 94:2 (2012), pp. 64-65.

DJ Coltart, ‘Surgery Between Hunter and Lister: As Exemplified by the Life and Works of Robert Liston (1794-1847)’, Proceedings Royal Society of Medicine, 65 (1972), pp. 26-30.

Reginald Magee, ‘Surgery in the Pre-Anaesthetic Era: The Life and Work of Robert Liston’, Health and History, 2:1 (2000), pp. 121-133.

A Sharee Wright and Pickney J Maxwel, ‘Robert Liston, M.D. (October 28, 1794-December 7, 1847): The Fastest Knife in the West End’, The American Surgeon, 80:1 (2014), pp. 1-2.

Get ready for fun with these math learning videos for kids! Learn about perimeter, fractions, Roman numerals and more! With these math videos math is a blast!

00:00 Fractions
7:56 Roman numerals
14:21 Division
22:42 Even and odd numbers
34:10 Multiplication
44:06 Perimeter
50:52 3D shapes

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What number is Peck thinking about? The last number you say is the number of dots! Learn how to count to nine with Peck the Bird from Khan Academy Kids.

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This tutorial video provides basic steps in using the GeoGebra graphing software. Enjoy exploring!

Geogebra Tutorial - function inspector

In this tutorial, we learn about the function inspector tool.