CATCH LIGHTNING IN A BOTTLE ⚡ Create a crackling electrical storm safely inside a jar! This science trick uses steel wool and a battery to make sparks fly like mini lightning bolts. Prep the Storm: Pull apart a small piece of fine-grade steel wool (0000 grade works best) to fluff it up. ​ Set the Stage: Place the steel wool inside a clean, dry glass jar. (Or spin it in a whisk for photos-but let's keep it in a jar for safety!). The Spark: Touch a 9-volt battery to the steel wool inside the jar.