Makeup and SFX artist Jo Steel performs a Luffy and Zoro combo cosplay tutorial.

Learn how to calculate the speed of a mass in a circular pendulum with this clear physics tutorial! Step-by-step explanations make it easy to understand circular motion, energy, and angular velocity.

People like to pretend that engagement rings are chosen in moments of sudden clarity. A flash of certainty, a perfect ring spotted instantly, decision made. In reality, it almost never works that way.