Run a sponge under cool water, then wring it out until it is only slightly damp.
Place the sponge on a plate. Place one or more seeds on the sponge. Small seeds, such as radish seeds work best.
Place the plate near a window with sunlight where it won't be disturbed.
Watch the seeds over the next few days. Touch the sponge every day and drip a few drops of water on it if it gets totally dry. Within a couple days, your seeds should start to sprout.
Make a small hole in loose soil for each seed you wish to continue growing. Carefully bury the root of the seed without damaging the root or stem of the plant.