Montana became the forty-first state of the United States in 1889. Its name comes from the Spanish word montana, meaning mountainous. Its nicknames are the Treasure State and Big Sky Country. Copper mining, lumbering, and tourism are major sources of income. The state’s southeastern section has reserves of low-sulphur coal. Montana ranks fourth in area and forty-fourth in population. Children could learn more about Montana by visiting: Montana.
Louvre opened in Paris, France, in 1793. Probably one of its most famous paintings is the Mona Lisa. The Louvre galleries measure eight miles in total, and the museum owns over one million pieces of art. I. M. Pei designed the Louvre Pyramid, completed in 1989. The Louvre website is filled with great online tours and activities: Louvre.
X-rays were discovered by Dr. Wilhelm Roentgen in 1895. He was conducting experiments in other fields when he recognized the importance of the rays he called X-rays. He then began to systematically study and document the newly discovered X-rays. He received the the first Nobel Prize in Physics in 1901. Children can learn a great deal about X-rays at: Nobel and they can view a video about X-rays at: X-Ray Video.