The hidden physics behind ordinary annoyances, objects and tiny mysteries you notice every day.
Everyday ScienceWhy do shopping cart wheels wobble?A caster is built to trail behind its swivel axis. Wear, looseness and the right speed can turn that self-aligning design into a rapid side-to-side shimmy.Read the answer →Everyday ScienceWhy do shoelaces untie themselves?Two motions work together: repeated foot strikes loosen the knot, then the swinging free ends pull lace through it until failure runs away.Read the answer →Everyday ScienceWhy do things look darker when they get wet?Water fills microscopic gaps and changes refraction, so light can enter the material more easily and get another chance to be absorbed before it returns to your eyes.Read the answer →Everyday ScienceWhy does aluminum foil have a shiny side and a dull side?During the final rolling step, two layers go through the mill together. The sides touching polished rollers turn shiny; the two inner faces stay dull.Read the answer →