Physics, 育児 (日本語) ニュートンのゆりかご Saturday September 1st, 2018 Kenji Tweet Sorry, this entry is only available in 日本語. Related PostsCreating a Robot: LizardroidCalculate Circle Area – Why is it \( \pi r^2 \) ? Readers who viewed this page, also viewed:Creating a Robot: Lizardroid Tweet