A study of Australian students found that teens who reached puberty later had times the rate of self-harm as did other students.

In 100,000 years, the rotation of earth will be slower by how many seconds?

What does one prolonged blast and one short blast mean?

The persian wars started when emperor darius i began an invasion of greece. what caused darius to decide to attack greece? a. greek pirates had raided persia's merchant ships and coastal towns. b. greek armies had attacked and taken over land that belonged to persia. c. greek city-states had supported rebellions in the persian empire. d. greek leaders had declared independence from the persian empire.