Polyester and nylon look similar, but they behave very differently under repeated impact. When a metal counter sink drops from two feet above, polyester fabric stretched across a wood frame survives more than ten drops without tearing. Nylon, tested the same way, tears after an average of just two drops. Heating both fabrics in an oven at 250 degrees Fahrenheit does not change the result — polyester still holds, nylon still fails quickly.

A more expensive bicycle helmet might seem like a safer one, but price alone does not tell the whole story. In this test, a 3 kg weight drops from 2 meters onto three helmet brands at different price points, each secured over a basketball pumped to the same pressure. A pressure gauge on the ball records the peak force on each drop. After five drops per helmet, all three brands produce similar pressure readings. That means the price tag does not appear to determine how well a helmet absorbs a hit.

Temperature shifts how materials behave, but does it change how glass breaks when struck? To find out, 25 glass sheets are brought to five temperatures ranging from 0 to 100 degrees Celsius, then a metal ball is dropped through a PVC pipe onto each one. The key question after each strike: does the sheet stay whole, or does it shatter into many pieces? By comparing break patterns across all five temperature conditions, the experiment reveals whether thermal state makes any difference to how glass stands up to impact.