1. If you accidentally eat a razor blade, there's no need to worry about the fact that the human stomach is highly acidic and can destroy a razor blade within 2 hours. But it is certain that the mouth will hurt.
2. Eating bananas can make you die because this fruit contains radioactive potassium. But calm down, humans need 10 million bananas at once to die from radiation.
3. Some types of marine animals such as turtles and salmon, are able to detect the earth's magnetic field by directing themselves. That's why they always find their way home. Unless they are caught by a fisherman.
4. Many people think that the main source of our oxygen is forested, in fact, the oceans contribute at least half of the total amount of oxygen on earth.