How old is the earth?

1)if a revolution merely replaces one authoritarian ruler with another, is it still a a revolution? a turning point? 2) “the great events of history have a way of defying ideological manipulation”, according to serge schmemann, a pulitzer prize winning journalist. do you agree, why or why not? other thoughts?

American troops were worried about cantracting in cuba a. yellow fever b. hepatitis c. polio

What number was abraham lincoln president