Membranes are thin, flexible layers that act like barriers or filters, separating different spaces or substances while allowing certain things to pass through. Think of them as sheets or films—some natural, others human-made. In living things, cell membranes are crucial. They wrap around cells, controlling what enters or exits, like nutrients in and waste out. These biological membranes are built from fats and proteins, working together to keep cells alive. Outside nature, humans create synthetic membranes for everyday uses. For example, water filters use membranes to trap contaminants while letting clean water flow. Even something as…
