Secular humanism is a comprehensive life stance or world view which embraces human reason, metaphysical naturalism, altruistic morality and distributive justice, and consciously rejects supernatural claims, theistic faith and religiosity, pseudoscience, and superstition.
A lava lamp is made by mixing alcohol and water and mineral oil and dyes, combining each separately. By mixing water and alcohol in the correct proportions, the mineral oil can be made to float.
During the cooling stage, the pumice still contains gas and air bubbles inside from the lava it used to be. The gas bubbles inside expand and exit the still molten rock making holes all over the rock. Once the rock completely cools and becomes pumice, the holes don't have enough time to cave in, so the rock forms with the holes still on it.