If you keep fireworks at home it is very important to store them away from flammable products, electrical equipment or anywhere that they could be subjected to sparks (a grinding machine may give rise to sparks). As an additional precaution, you should also keep fireworks in a secure place where children can’t reach them.

Hanna’s uncle is cleaning-up the garage. He has found two fireworks in a box. The box is placed next to the grinding machine on the workbench. He puts on Hanna’s old sunglasses and moves the box to a dark, cool spot in the garage.

Why is Hanna’s uncle wearing her sunglasses while moving the box with fireworks?