Thinking about how large a cell is compared to viruses, proteins and simple molecules.
The nearest stars to our solar system, are located in the Alpha Centauri system. The two main stars are Alpha Centauri A and Alpha Centauri B, which are approximately 4.3 light years away from Earth. The third star in the Alpha Centauri system, Proxima Centauri, is actually the closest star to our solar system at approximately 4.2 lightyears away from Earth. Created by Sal Khan.
Scale of Earth and Sun. Created by Sal Khan.
Sal Khan describes the scale of our Solar System. Created by Sal Khan and NASA.
An introduction to the Scale of the Galaxy. Created by Sal Khan.
Attempting to comprehend the scale of the large. Created by Sal Khan.
From honey bees to cells, viruses, and atoms -- understanding the scale of the very small. Created by Sal Khan.
How the scientific method is used to ask questions and test explanations.
Why our closeness to the sun does not dictate the seasons. Created by Sal Khan.
Second Law of Thermodynamics and entropy: the entropy of the universe constantly increases.
Explanation of the second law of thermodynamics.
Securing and wiring the motors. Created by Karl Wendt.
S-waves and P-waves. Created by Sal Khan.
Overview of how the body's immune system determines between self and non-self.
Conservative replication, dispersive replication, and semi-conservative replication.
Why does the deflection change when an electromagnet is attached to the circuit? Does it matter what side of the electromagnet we test? Created by Brit Cruise.
Resistors connected head-to-tail are in series. The equivalent overall resistance is the sum of the individual resistance values. Created by Willy McAllister.
Resistors connected head-to-tail are in series. The equivalent overall resistance is the sum of the individual resistance values. Created by Willy McAllister.
An overview of Setting innerHTML and textContent
The use of shape in visual storytelling.