The LEGO brick's stud-and-tube coupling system was patented in 1958, and its fundamental design hasn't changed significantly since then, ensuring almost limitless compatibility between old and new bricks.elaborate
Henna's staining power comes from lawsone, a naturally occurring dye molecule also found in the henna plant's leaves, not the plant's sap as many believe.
elaborate
Ice skates work because the pressure of the blade melts a thin layer of ice, creating a lubricating layer of water that allows for smooth gliding.
elaborate