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The Twin Paradox (Wikipedia article)
Before watching the video on the twin paradox, please answer the following questions:
What is the Lorentz factor when travelling at 86.6% of the speed of light in a vacuum?
Traveling at a speed of 0.866c, how long will it take for a round-trip journey to a star 10 light years away, and back to Earth?
Einstein’s twin paradox explained – Amber Stuver (6:15)
minutephysics – Complete Solution To The Twins Paradox (3:33)
The Ladder Paradox (Wikipedia article)
Einstein’s Ladder Paradox; Simply Explained (2:48)