SciShow
Inside the Chernobyl Exclusion Zone
SciShow takes you inside the site of the world's worst nuclear disaster to show you how, nearly 30 years later, life has adapted and persisted.
SciShow
Do We Need a Negative Leap Second?
Did you know that last year we had 28 of the fastest days ever recorded? Earth's rotation can be affected by a number of things, and scientists think we might someday need an unprecedented adjustment: deleting a second!
SciShow
The Best Atomic Clock Ever Built?
Turns out, two atomic clocks are indeed better than one. And what role does sleep play in memory suppression?
SciShow
Inside the Ice Man Dark Matter Mystery and Fukushima Cleanup
Hank throws three bite-sized stories at ya: the sequencing of 5300-year-old ice man Oetzi's genome; a confusing mass of dark matter; and how the cleanup of the Fukushima disaster is going one year later.
SciShow
5 of the Best Measurements In Science
Proving something right isn’t just about quantity. It’s also about quality and over the years, scientists have made measurements proving that we understand ridiculously well how the universe works.
SciShow
Do We Need a Negative Leap Second?
Did you know that last year we had 28 of the fastest days ever recorded? Earth's rotation can be affected by a number of things, and scientists think we might someday need an unprecedented adjustment: deleting a second!
SciShow
A Brief History of Timekeeping
It's time for another leap second! Join SciShow as we celebrate by exploring the long and strange history of timekeeping.
TED-Ed
Who decides how long a second is? | John Kitching
In 1967, researchers gathered to answer a long-running scientific question: just how long is a second? It might seem obvious at first. A second is the tick of a clock, the swing of a pendulum, the time it takes to count to one. But how...
Bozeman Science
Drawing Lewis Dot Diagrams
Mr. Andersen shows you how to draw Lewis Dot Diagrams for atoms and simple molecules.
Bozeman Science
A Tour of the Periodic Table
Mr. Andersen describes the major groups on the periodic table.
Curated Video
GCSE Chemistry - Group 1 Alkali Metals #11
What are alkali metals? Why are they so reactive? What are the trends as you go down the group? How do they react with water, oxygen and chlorine? Learn all this and more!
Learn French With Alexa
French ordinal numbers - First, Second, Third, Fourth, etc.
Alexa teaches you ordinal numbers in French
Curated Video
What Have Sunflowers Got To Do With Nuclear Disasters?
Sunflowers are the international symbol for nuclear disarmament. You will most likely find sunflowers around areas where nuclear disasters have occurred in the past. Following the 1986 meltdown at the Chernobyl Power Plant in Ukraine,...
Curated Video
Main groups in the modern periodic table | Summary
Main groups in the modern periodic table | Summary
FuseSchool
Group1 As An Example Of Groups In The Periodic Table
Learn the basics about Group 1, as an example of Groups in the periodic table.
Curated Video
Which Is The Most Reactive Element In The Periodic Table?
The reactivity of an element is a function of how easily an element loses or gains electrons. To determine an element's reactivity, we can learn a lot from the periodic table, and its particular trends. The first element in the halogen...
Professor Dave Explains
Periodic Table Part 2: Alkali Metals (Li, Na, K, Rb, Cs, Fr)
It's time to check out Group 1 on the periodic table, the alkali metals. This includes lithium, sodium, potassium, rubidium, cesium, and francium. What can we say about their properties, reactivities, and applications? Let's find out!
FuseSchool
What are Groups in the Periodic Table?
What actually are the groups in the periodic table? And why are they structured in that way? Find out the answers in this Chemistry video from The Virtual School.
ProTeachersVideo
Alkali Metals - Reactivity with Water
A look at the chemical properties of elements in group 1 of the periodic table (the alkali metals) showing how the metals react with water, and trends of reactivity and melting point. KS3 and KS4 Chemistry.
FuseSchool
Group 1 - The Alkali Metals | The Periodic Table
A great summary about Group 1 in the Periodic table - The Alkali Metals.
Curated Video
Understanding Exponential Decay
In this video, the concept of exponential decay and the half-life of radioactive elements, specifically cesium-137, are explained. The video demonstrates how to use an exponential decay function to predict the amount of cesium-137...
University of Nottingham
University of Nottingham: Periodic Table of Videos: Cesium
A look at cesium and its reactive properties. [7:17]