Explainer Hub on Instagram: "When an extremely hot object touches glass, the glass doesn’t fail because it’s weak — it fails because it can’t react fast enough. Glass is a poor conductor of heat. That means the part touching the hot surface expands rapidly, while the rest of the glass stays cool and rigid. This sudden temperature difference creates intense internal stress. With nowhere for that stress to escape, tiny cracks form instantly and spread at lightning speed, causing the glass to fract