They are all greenhouse gasses They are all harmless to breathe They are all man-made gases They are all noble gases What do Albert Einstein, Bob Dylan and Bill Clinton have in common?
hamburg is the second largest city in Germany Alemanha Rússia Itália Áustria Onde fica Zaragoza? Espanha Escôcia Portugal Brasil Os 5 principais oceanos da Terra são o Atlântico, o Pacífico ...