Magnetism

Since ancient times, people have known about some rocks that could attract iron. When these rocks were rubbed on other types of metal, they had the power to make them attractive too. These items could also push each other away, repelling each other.

A dark grey and brow rock with a textured surface. On this, three metal nails are sticking to it. — Lodestone, one of a few minerals that are naturally magnetic.

Predict the Solar Cycle

The Sun is a constant presence in our life on Earth. It gives us the heat and light we need to survive. But it is not a stable place. The Sun is a ball of hot plasma which is constantly changing.