Aluminum foil.
Top 3 anyway. Sometimes called ‘tin foil‘, for historical reasons, but it’s actually made of aluminum.
Surprised? I was. But then I considered how fragile it is. And the amount of energy required, to press metal that thin.
Cars, Security and a Peek into my Life
dB – sound is measured in decibels
– buildings can crumble using sound. There’s a theory, that that’s how the Egyptians cut stone so perfectly (a dollar bill can’t fit between the pyramid stones)
– the threshold of pain is 120 dB
– below is a box of $20 headphones.