Two weeks from this issue's publication date, the hour of sleep we lose to daylight savings will leave many of us feeling a little groggy or a bit behind schedule. Going to bed early a few days before ...

This graphic was updated on Feb. 11, 2020, to clarify the plot of density versus temperature for water and ice. Originally, the plot depicted density versus temperature for liquid water at all ...

Note: This video is designed to help the teacher better understand the lesson and is NOT intended to be shown to students. It includes observations and conclusions that students are meant to make on ...

Note: This video is designed to help the teacher better understand the lesson and is NOT intended to be shown to students. It includes observations and conclusions that students are meant to make on ...