Learn the mind-boggling math behind Santa's busy night.

Learn how to use probability to think about alien life.

Learn how turkeys and aliens can help you become better at math.

Learn what mixed fractions are and find out how they're related to regular fractions. SPONSOR: Try lynda.com free for 7 days by visiting lynda.com/math!

Learn how statistical and systematic uncertainties explain polling errors.

Learn how to build a scale model of the entire Universe.

Learn how to make sense of some of the Earth’s key statistics.

More tips and tricks to help make sense of measurements.

Learn about the geometry behind the phases of the Moon.

Learn all about the family of shapes known as polygons.