Why Doesn't SpaceX Recover the Second Stage

In this animation we look at why SpaceX doesn't recover and reuse the second stage!
SpaceX has made getting to space much more affordable through reusability of its first stage. Why don't they recover the whole rocket and make space that much more affordable?

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Time Stamps
Intro - 00:00
Falcon 9 Details - 00:44
Liftoff - 01:09
Rocket Engine Basics - 01:58
How Does the Rocket Get to Orbit - 06:48
Why a Second Stage is Used - 07:43
First stage landing on earth - 09:08
Review on Why Only the First Stage Is Recovered - 09:48
Note: The physics and numerical data throughout this animation is in no way faultless. Theories have been simplified for comprehensibility.

Видео Why Doesn't SpaceX Recover the Second Stage канала Animations Xplaned