Apparently, this user prefers to keep an air of mystery about them.
25 How is the mass of the Earth determined? apr 24 '14
16 Is it true that distance between earth and sun is closer in winter season (January) and farther in summer season in the Northern Hemisphere? jan 3
16 How did helium deposits form? aug 23
14 Why do Earth and Venus have different atmospheres? may 13 '14
13 Why do we recycle paper? apr 15