1.Identify bad eggs
If you don't know if the eggs have gone bad, put them in a bowl of cold water. Bad eggs float on the surface of the water, while good eggs sink to the bottom. Because the gas and moisture produced by the rotting eggs will run away through the shell, the weight is lighter.
Cool down your drink quickly
To cool the drink in a short period of time, you can wrap the bottle in a damp paper towel. When the water in the paper towel evaporates, it takes away a lot of heat, which cools down faster than if it were left in the air to cool it naturally.
Reduces the bitterness of coffee
If you find the coffee too bitter, add a pinch of salt to it. When drinking coffee, the sodium ions in the salt solution activate salty receptors on the tongue, balancing our perception of bitterness.
Cut onions without tears
When an onion is cut, the cells of the onion are destroyed, causing it to release a sulfur-containing tear-inducing factor that stimulates our eyes to water. However, if we put the onion in the refrigerator for a period of time in advance, the low temperature will slow down the reaction rate inside the onion, which will also reduce the tear-inducing factor produced.
Lemon juice preservation
To keep the cut apple or avocado fresh the next day, you can dip the cut in lemon juice. The cut surface of an apple turns brown when exposed to the air because the phenolic compounds in the apple are oxidized by the enzyme polyphenol oxidase, resulting in a brown substance. The acidity of lemon juice can reduce the activity of enzymes, and vitamin C can also preferentially undergo oxidation reactions, which plays a role in preserving freshness.