Hank describes the desperate need many organisms have for nutrients (specifically nitrogen and phosphorus) and how they go about getting them via the nitrogen and phosphorus cycles.

When we began mass-producing matches in the 1800s, workers in the factories started dying mysteriously. The history of our sparking little flame-sticks is darker than you think.

Want to learn more about the topic in this week's video? Here are some keywords to get your googling started: <br/>
Leaf senescence, chlorophyll, carotenoid, anthocyanin

Thanks to my grandmother for inspiring this story, and to my mother for helping make it.



Bird poop was the gateway fertilizer that turned humanity onto the...

Hank talks about the last major way humans are impacting the environment in this penultimate episode of Crash Course Ecology. Pollution takes many forms - from the simplest piece of litter to the more complex endocrine distruptors - and...

Paul Andersen describes the important features of the skeletal system. He starts by comparing and contrasting endoskeletons and exoskeletons. He then explains how the human skeleton provides support, movement, storage, blood production...

Mr. Andersen describes the major groups on the periodic table.

Although early scientists knew heredity came from within organisms, they couldn't initially identify the genetic material until pivotal experiments like those of Griffith and later Hershey and Chase. In 1952, Hershey and Chase used...

How Hennig Brand's quest for gold led him to discover phosphorus by boiling urine in 1669.<br/>

A covalent compound is formed when 2 nonmetals bond together. When we have a covalent compound we have to use a specific set of naming rules. The first rules is that the first element keeps its name. The second rule is that the second...

In this video we walkthrough 3 limiting reactant practice problems step by step and show you how to solve them!

This videos will cover how to name covalent compounds. It is important to remember that we have to use prefixes when we name covalent compounds. Covalent bonds, or compounds, form between 2 nonmetals, or 2 anions. In a covalent bond the...

Molecules like PF5, SF₆ defy the octet rule, with expanded valence shells or unpaired electrons, arising from the availability of d-orbitals or radical stability

Phosphorus is a versatile element, found in our DNA as well as fireworks and fertilisers.



Chemistry - Periodic Table - Learni

ng Points.

Phosphorus helps conve

rt food into energy.

P

hosphorus is...

Revealing the elements which make up the human body, and their relative abundance.
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Chemistry - Periodic Table - L
ea
rning Points.
/> A Twig FactPack Film.
Open a discussion on what has been already...

Bones are living, growing tissues. What are they made of and how do they develop from young to old? Biology - Human Body - Learning Points. Bones support the body and protect vital organs. When you are born you have around 300 bones,...

The story of Hennig Brand and how he discovered the element phosphorus by boiling buckets of urine. Discover why his experiments paved the way for the discovery of the modern chemical elements. Chemistry - Periodic Table - Learning...

Learn about the surprising benefits a volcanic eruption can bring to an environment.
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Life processes - Living things in their environments - Role of t
h

e environment />

Learning Points
Natural...

Find out why some resources are in short supply and why we need to conserve as much as possible.
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People and places -Human impact on the environment - Overu
s

ing resources />

Learning Points...

Paper upcycling: its importance, process, and environmental impact. Learn how to reduce waste and reuse materials while testing eco-friendly fertilizers.

How Hennig Brand's quest for gold led him to discover phosphorus by boiling urine in 1669.

Explore the invaluable contributions of bacteria to our world. Discover how decomposers break down organic matter, enabling soil enrichment for plant growth. Learn how bacteria assist in environmental cleanup, particularly during oil...

This video covers:

- The different colours of visible l
ight
- How light is used is optic
al fibres
- The concept of fluorescence with ultrav
iolet radiation
- How ultraviolet radiation can

be used in...

Learn about the Other Non-Metals group of the Periodic Table with Non-Metals and Other Non-Metals Song Periodic Table by KLT.