Słuchacze pytają, my odpowiadamy. A właściwie dr Rożek odpowiada. Dzisiaj bierzemy na warsztat pytanie o Dziadka Leszka w imieniu nastoletniego wnuka (a .. urodziłem się w roku przestępnym, którego suma cyfr jest kwadratem cyfry: Co to są metale ziem rzadkich? i skąd nazwa?
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