Around the globe, hotter temperatures stoked by climate change are increasing the odds of both severe drought and heavier ...

Water never leaves the Earth and its atmosphere. It simply moves around in what is called the water cycle. The water cycle is the continuous journey of water from oceans and lakes, to clouds ...

1. Introduce the idea of building a model of the water cycle. Remind students that they have seen and used drawings and animations as models of a solid, liquid, and gas. Tell students that they will ...

has spent several years creating the animations below. They graphically represent the life cycle of HIV-1, from the initial binding of the viral particle onto a host cell (Viral Entry), through ...