Everyone's heard of leap years ... but what about leap seconds? Young scientists get acquainted with one of humankind's most awkward standard measurements with a short video from a PBS playlist covering space and time...

This lesson will demonstrate how to determine the correct number of significant figures in a measurement (both analog and digital). It is 3 of 3 in the series titled "Significant Figures in a Measurement."

This lesson will demonstrate how to determine the correct number of significant figures in a measurement (both analog and digital). It is 1 of 3 in the series titled "Significant Figures in a Measurement."