1.  The earth has undergone numerous ice ages. A typical ice age lasts 40,000 to 60,000 years. Inter-glacial periods are similar. Ice covered all of Canada and the northern parts of the United States. It was thickest near Hudson Bay, perhaps 8,000 to 10,000 feet thick. So much water was tied up in ice that the sea level was 300 feet lower. The last ice age ended about 10,000 years ago.

2.  The production of ice cream uses one-tenth of the nation's milk supply.

3.  Icebergs can be huge, perhaps 400 feet high, and miles long. Only one-seventh to one-tenth of the iceberg is above water level.

4.  An iceboat is a sailboat with runners, propelled by the wind. They quickly reach speeds up to 3 1/2 times that of the wind--up to 100 miles per hour.

5.  The Antarctic ice cap is up to 6,000 feet thick, and covers an area the size of the United States, Mexico, and Central America.

6.  An impala may leap 30 feet and run 50 MPH.

7.  President Andrew Johnson was impeached and missed conviction and removal from office by just one vote. He favored a much milder policy towards the South than did a strong group in Congress.

8.  A constitution was written and approved by the people in 1905 to form the state of Sequoyah from the Indian Lands in eastern Oklahoma, but Congress formed the state of Oklahoma instead in 1906.

9.  There were about one million Indians in what is now the United States when European whites arrived. By 1900 there were 237,000.

10.  Indonesia consists of more than 13,600 islands, half uninhabited.

11.  New Guinea and Borneo are the second and third largest islands in the world after Greenland.

12.  Indonesia is the fifth most populous country in the world, but less than 1% of the population owns an automobile. That is because of the many islands, thick forests, rugged mountains, and few roads.

13.  The Red Delicious apple developed from the stump of a stray apple tree in Iowa that put forth some shoots in an orchard in the 1880s. It won first place in an apple contest, and was purchased by Stark Bros. Nursery, who named it.