How does a walkie-talkie work and why do people still use them ?

Imagine you are standing in the antarctic during the southern hemisphere summer. the sky is clear and blue. there are no clouds in the sky. your shadow is cast on the icy ground. what is the color of the shadow?

The frequencies refer to the sample data collected from a population of interest when performing a hypothesis test comparing two or more population proportions.

What are the north and south poles of a solenoid change with?