RSS2つの球をくっつけるとコマになる
木やガラスや鉄でできたボールを2つ、接着剤でくっつけてはじくと、コマとなってキレイに回る。球の数は2個じゃなくてもいいみたいです。
Posted by Takumi Funada |
Jul 2, 2009 03:00 AM
Science |
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