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Einstein, Albert

Square device with objects at the four corners labeled N-E-S-O and a single object in the middle of the square. Caption: called an interferometer,
52 minutes 14 seconds
Grade Level: 11 - 12
Close up of bones in a human body with a bright point of light at one of the joints. Caption: So they were named "x-rays."
Season 0 / Ep 1
50 minutes 20 seconds
Grade Level: 9 - 12
Black and white closeup photo of Marie Curie with hair pulled back in a bun. She looks directly into camera.
26 minutes
Grade Level: 7 - 12
A diagram illustrates a solar eclipse. An object has its actual position behind the Sun. The line of sight of this object from the Earth is a curved line. But, the object it is observed at a different position from the Earth. This line of observation is a straight line. The angle between the two lines is labeled, proof.
1 minutes 9 seconds
Grade Level: 7 - 12
Illustration of Earth covered in white dots. Caption: an earthbound observer sees time stretched, or dilated.
1 hours 2 minutes 52 seconds
Grade Level: 9 - 12