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Dolphin - animal or being reasonable?

Feldspar and other minerals

Neva River - "Nevsky Prospect" Volga-Baltic Waterway

Ob River - Blue artery Siberia

Aichryson - the flower of love and protector of family happiness

Lyre Bird - the master of imitation

Mass air - ???

What is the entropy of the Universe

Tree leaves in summer and autumn

Barnacles.

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Parallel lines and planes
Parents Lermontov and their biographies.
Right-angled triangle: the concept and properties