Electromagnets!

A magnet has two ends called poles, North and South.

Different poles attract (N sticks to S)

The same poles repel each other (push each other away)

Invisible field line connect the north to the south

4 common types of metal are magnetic, (Iron, steel, cobalt and nickel)

The rare earth elements samarium, dysprosium and neodymium are also magnetic

The strong neodymium magnets are a mix of neodymium, iron and boron

Inside magnetic materials are "domains"

Each domain has its own North and South pole

When all the domains line up in the same direction a stronger magnetic field is made

The spinning of electrons around an atom's nucleus creates a magnetic field

In some materials like iron the atoms can get lined up so that their atoms generate a magnetic field in the same direction

Each section of atoms spinning the same direction is a domain

Cranes

Levitating trains

Electronic locks

MRI machines

Wrap wire around a nail

Connect the wire to each end of a battery

Test: Different size batteries, different kinds of wire, longer or shorter wires