alwaysgivemyl-o-v-e-t-o-y-o-u:

thatscienceguy:

When glass breaks, the cracks move at around 3000 Miles per hour!! (4500km/h!) That’s why, even in slow motion, the main cracks in the glass appear virtually instantly as the hammer hits.

This is actually quite mesmerizing.

alwaysgivemyl-o-v-e-t-o-y-o-u:

thatscienceguy:

When glass breaks, the cracks move at around 3000 Miles per hour!! (4500km/h!) That’s why, even in slow motion, the main cracks in the glass appear virtually instantly as the hammer hits.

This is actually quite mesmerizing.