The human stomach can dissolve razor blades
On the rare occasion that you swallow a razor blade, don’t fret. The human body is more capable than you think. Acids are ranked on a scale from 0 to 14 — the lower the pH level the stronger the acid. Human stomach acid is typically 1.0 to 2.0, meaning that it has an impeccably strong pH. In a study, scientists found that the “thickened back of a single-edged blade” dissolved after two hours of immersion in stomach acid. These foods aren’t as horrid as a blade, but these are the 8 foods that GI docs avoid.
A laser can get trapped in water
Yes, really. A cool thing called total internal reflection is applied when pointing a laser beam through a container of water. When light travels through water, it’s slowed by the heavier particles in water, as described here. Thus, the laser beam effectively gets “trapped” in the water.