The easiest way to determine the freshness of an egg is to put it in a glass of water : if it has expired, it will float; and if, on the contrary, it is cool, it will fall to the bottom . The reason: the egg has two membranes, called testes, that line the inside of the shell. These films, which serve to protect the white and prevent the invasion of microbes, are in close contact, except at the blunt pole of the egg, where they form the so-called air chamber. As the egg ages and, therefore, loses freshness, this space enlarges and becomes a kind of float.
Is it possible to know if an egg is fresh before breaking it?
Japanese scientists create a 'washing machine for humans'
Can you imagine taking a relaxing bath in a machine that washes you with bubbles, plays relaxing music or videos?
Insect swarms generate as much electricity as a thunderstorm
Swarms of bees can generate an electrical charge of 1,000 volts per meter, a higher voltage density than thunderclouds and electrified dust storms.
This is what the Earth's magnetic field sounds like
The shield that protects our planet sounds 'pretty scary', according to ESA engineers.
Days were only 17 hours long 2.46 billion years ago
It was when the Moon was much closer to our planet. As the centuries pass, the Moon slowly recedes and the length of our day gradually lengthens accordingly.
Women are better at doing crosswords
A new study has revealed that women have a 'small but robust' advantage over time.