Explanation:
answer only:
1. Laser beams travel at the speed of light, more than 670 million miles per hour, making them the fastest thing in the universe.
2. According to the Mohs scale, talc, also known as soapstone, is the softest mineral; it is composed of a stack of weakly connected sheets that tend to slip apart under pressure. When it comes to metals, scientists try to measure hardness in absolute terms
