One of those scientific curiosities with no practical purpose that fascinates everyone. When gently thrown together in the air they rapidly repel and attract, emitting a loud, eerie (almost alien-like) buzzing sound. The two strongly-magnetic lozenges are made from haematite (also known as iron oxide), a naturally occurring mineral found in many countries.

• Magnets that buzz
• Rapidly repel and attract each other
• Made from hematite
• 6cm