Mwisho wa dunia kisayansi

kuanguka kwa jiwe au vimondo sio jambo la ajabu, maana imeshawai kutokea zaidi ya mara moja.
Lakini ni hatari sana, ilipo tokea iliua viumbe wengi sana, wachache tu walibakia, ilikuwa kwenye enzi za dinosaurs (it happened during the dinosaurs' age).
 
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