Psyche 16 - Golden asteroid, why it is easy to swim on sea as compared to river ?,why clouds happen black at a time of rainfall?, How many colours we can see through our eyes?,Gallium melting point?, how to block out sleep in night?, world's most expensive thing,gold mines<br /><br />Baarish ke samay baadal kaale kyon ho jaate hain?,<br /><br />Samudra me tairna zyada aasan kyon hota hai?,<br /><br />Raat me zyada kaise jaage ?,<br /><br />Duniya ki sabse mahegi cheez,<br /><br />Sone ki mines<br /><br />
