“How much of the light of the sun reaches the earth?”
“Question of the day #V” In my series of "question of the day" today one from a conversation with my 9 year old daughter who is preparing for a school [...]
16
03, 2014
“Question of the day #V” In my series of "question of the day" today one from a conversation with my 9 year old daughter who is preparing for a school [...]