"Some of the al-Tusi material is known to have reached Rome in the 15th century... but there is no evidence that Coper…"

"Ibn al-Shatir’s forgotten model was rediscovered in the late 1950’s by E. S. Kennedy. .. In a preliminary work, the C…"

"Mainstream geology is founded upon enunciated by James Hutton (1726–1797) and Charles Lyell (1797–1875), who argued t…"

"In August, 1933, at the in Chicago, was founded with an enrollment of 57 charter members and and as the first Preside…"

"Since the opening of the , images from have enabled us to map the surfaces of all the rocky planets and in the Solar …"

"It is almost a marvel that trees should live to become the oldest of living things. Fastened in one place, their stru…"

"As soon as the 's is completed, it begins to accumulate trash and mud. In a little while, usually, it is covered with…"

"Most insects have enemies to bite them. The spreads death among injurious grubs. Efforts to control forest-enemies wi…"

"Mills gave occasional talks which led to a career as a speaker. His reputation and influence as a writer provided him…"

"The , which measures the , together with the total energy density of the Universe, sets the size of the observable Un…"