「地球の赤道の速度とHDDの円盤の一番外側の速度はどちらが速いのだろう」と気になったので計算した。…

Default Widget

This is Sidebar 1. You can edit the content that appears here by visiting your Widgets panel and modifying the current widgets in Sidebar 1. Or, if you want to be a true ninja, you can add your own content to this sidebar by using the appropriate hooks.