1. What cannot be picked out is the moon in the mirror. What cannot be picked out are flowers in the water - the image formed by a flat mirror is a virtual image. 2. When people unite, Mount Tai will move - If the directions of each component force are the same, then the magnitude of the resultant force is equal to the sum of the magnitudes of each component force. 3. Lifting tofu with hemp rope - it cannot be lifted - when the pressure is constant, if the force-bearing area is small, the pressure will be large. 4. Real gold is not afraid of fire, and truth is not afraid of arguments. From the perspective of the melting point of gold, although it is not the highest, it is still 1068°C. The temperature of the general flame is about 800°C. Since the temperature of the flame is lower than the melting point of gold, So gold cannot melt. 5. Draw fire from the bottom of the cauldron - There are two conditions for liquid boiling: one is to reach the boiling point, and the other is to continue to absorb heat. If you "draw the fuel", you can stop the liquid from boiling. 6. Flowers blooming inside the wall will fragrant outside the wall - Because the flowers are constantly moving irregularly, the fragrance of flowers inside the wall will spread outside the wall. 7. Sitting in a well and looking at the sky, you will see very little - since light travels in straight lines, it can be known from the knowledge of geometric drawing that the frog's field of view will be very small. 8. Feeling like sitting on pins and needles - According to the pressure formula, when the pressure is constant, the smaller the force-bearing area, the greater the pressure. People will feel extremely uncomfortable sitting on such a felt. 9. A slap cannot make a sound - Force is the effect of an object on an object. Only when one slap slaps another palm or slaps on other objects can the force be exerted and the slap be made. 10. Four or two moves a thousand pounds - the balance condition of the lever, increase the ratio of the power arm and the resistance arm, and only need to use less power to lift heavy objects. 11. Mercury falls to the ground - pervasive - the density of mercury is greater than the density of the materials that make up the ground, and mercury is fluid, so it always sinks under other materials. 12. Loach and eel make friends - slippery head versus slippery head - the surface of both loach and eel is smooth and lubricated, with low friction. 12. If the egg hits the stone - it's over - the pressure the eggshell withstands is much less than the pressure the stone can withstand. If the egg hits the stone, the egg will break first. 13. A large ship leaks water - there is ingress but no exit - there is pressure inside the liquid. After the ship breaks, the water outside the ship is pressed into the ship until the water surface inside and outside the ship is equal. At this time, the water inside the ship will not flow outward. 14. A gourd on the water - cannot sink - the density of the gourd is less than that of water, so it can only float on the water.

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