Think through the result of getting a new heart, and how the heart can still maintain homeostasis when the nerves are no longer around. Rishi is a pediatric infectious disease physician and works at Khan Academy.

This "The Global Carbon Cycle" learning object is the from the Sumanas resource series. Sumanas offers a robust selection of content and services that are directed at enhancing the learning experience.

This survey course introduces students to the important and basic material on human fertility, population growth, the demographic transition and population policy. Topics include: the human and environmental dimensions of population pressure, demographic history, economic and cultural causes of demographic change, environmental carrying capacity and sustainability. Political, religious and ethical issues surrounding fertility are also addressed. The lectures and readings attempt to balance theoretical and demographic scale analyzes with studies of individual humans and communities. The perspective is global with both developed and developing countries included.

Helping students understand and enjoy biochemistry (without going broke) is our primary motivation for writing this book. We have aimed to provide a more thorough coverage of topics than in Biochemistry Free and Easy, but we do not aim to provide an encyclopedic biochemistry tome covering content that no instructor would fully cover in a single course.

Find out whether oxygen or carbon dioxide has a higher rate of diffusion (Hint: It pays to be small!). Rishi is a pediatric infectious disease physician and works at Khan Academy. These videos do not provide medical advice and are for informational purposes only. The videos are not intended to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of a qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read or seen in any Khan Academy video.

Hank fills us in on the endocrine system - the system of glands which produce and secrete different types of hormones directly into the bloodstream to regulate the body's growth, metabolism, and sexual development & function.

The video resource "Great Glands - Your Endocrine System: CrashCourse Biology #33" is included in the "Biology" course from the resources series of "Crash Course". Crash Course is a educational video series from John and Hank Green.

Green infrastructure and related nature-based solutions are gaining widespread support as effective components of healthy city building as well as climate adaptation strategies. The course provides an overview of how GI systems work, the ecosystem services they can provide, and how they can be employed effectively.

In this video Paul Andersen explains how the greenhouse effect and greenhouse gases keep our planet warm enough to be habitable. He explains how greenhouse gases keep heat closer to the surface. He finally shows how increases in greenhouse gases may lead to dangerous global warming.

This "The Greenhouse Effect" learning object is the from the Sumanas resource series. Sumanas offers a robust selection of content and services that are directed at enhancing the learning experience.

Learn to read a growth curve which measures height and weight as we grow older!

Quiz questions that accompany the text are available for faculty and instructors. Request access by providing your credentials and contacting us at learnlib@umn.edu.

This "Guinea Worm Infection and Eradication Programs" learning object is the from the Sumanas resource series. Sumanas offers a robust selection of content and services that are directed at enhancing the learning experience.

This TED talk by Hans Roslin makes the point that the washing machine was the greatest invention of the Industrial Resolution. The resource, "Hans Rosling: the Magic Washing Machine" included in "Lesson 2 Material Possessions and Sustainability" is a part of "Unit 01 What is Sustainability" included in Energy & Sustainability ES - Course 1.

In this video Paul Andersen explains the elements in the Hardy-Weinberg equation; including the allele frequency and phenotype frequency. He begins with a brief explanation of phenotypes and genotypes. A sample problem is worked out and another problem is included.

Paul Andersen explains how you can combine the power of a Punnett square for an entire gene pool.  Hardy-Weinberg equilibrium will remains constant under several constrains and the probability square makes the information more understandable.

This animation shows how harvest animation robots could be used in the collection process. The resource, "Collection (Video)" within "Lesson 03 Robots" is a part of Unit 06 Precsion Ag Automation included in Agriscience & Biotechnology, Ag Bio - Course 4.

This animation shows how how robots can be used to consolidate plants in a large scale agricultural greenhouse production. The resource, "Consolidation (Video)" within "Lesson 03 Robots" is a part of Unit 06 Precsion Ag Automation included in Agriscience & Biotechnology, Ag Bio - Course 4.