Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to make hydrogen (science experiment ) [title] Pour water into a glass container. [step] Avoid using plastic or metal for this. You will be running an electric current through the water that could melt plastics.

Ending1: Metal will conduct this current and could shock you if you touch the container. [substeps] If you are unfamiliar with this experiment, start with one cup of water. Ending2: Use a metal or plastic container that is well sealed with a lid. You will now open the top of the container and pour the hydrogen water right in. Ending3: [title] Stir the hydrogen--and water--together with a spoon. [step] Some of the hydrogen should form electrons and others should float in the water. Ending4: [title] Process the water for a set period of 24 hours, usually 30 minutes to an hour period. [step] It may take up to an hour for small-scale macro discolorations to form, so err on the side of caution.

Answer format: ending1/ending2/ending3/ending4