Instructional Video4:46
SciShow

The Hostile World Where Animal Life Began

12th - Higher Ed
For decades, researchers thought they had a solid idea about the earliest booms in animal life. But new research might have turned off the gas on all these ideas, flipping our understanding of the Avalon explosion and the Cambrian...
Instructional Video5:27
SciShow

Space Headwinds Might Help Us Find Dark Matter

12th - Higher Ed
Some scientists are hoping to use our motion through the galaxy to help detect some of the most elusive particles of all: dark matter.
Instructional Video11:26
SciShow

6 'Undetectable' Poisons (and How to Detect Them)

12th - Higher Ed
Poisoning has always been a popular method of getting rid of one’s enemies, but is there actually a “perfect” poison capable of being completely undetectable? Here are 6 of the poisons that have confounded doctors throughout...
Instructional Video6:37
Professor Dave Explains

Practice Problem: Ionization Energy

9th - Higher Ed
When we learned about periodic trends, we learned about ionization energy. Just how much energy is required to remove an electron from an atom? What about a second electron, or a third? Let's compare a few different ionizations and see...
Instructional Video9:26
Professor Dave Explains

Periodic Table Part 4: Boron Group (B, Al, Ga, In, Tl, Nh)

9th - Higher Ed
It's time to check out Group 13 on the periodic table, the boron group. This includes boron, aluminum, gallium, indium, thallium, and nihonium. What can we say about their properties, reactivities, and applications? Let's find out!