Gradients, a form of the del operator, are a way to measure change in field strength across one, two, or even three dimensional space. They come up all over physics: fluid dynamics, conservative forces, electrodynamics, cosmology. They're the reason that anything ever happens.
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VIDEO ANNOTATIONS/CARDS

What the HECK is Energy?
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RELATED YOUTUBE VIDEOS

3blue1brown on the Del Operator:
   • Divergence and curl:  The language of...  

Eugene on Gradients:
   • Gradients and Partial Derivatives  

Khan Academy on Gradients:
   • Gradient and graphs  
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