7 Most Dangerous Jellyfish in the Underwater World

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Portuguese boat (Physalia physalis)

The second name for jellyfish is physalia. Although this is rather not even a jellyfish, but a whole colony of polypoid and medusoid individuals. The «bite» of a Portuguese boat is extremely dangerous and painful (sensations are compared to hitting the skin with a whip). The main risk is the systemic effects of the poison. In severe cases, intense pain is followed by fever, shock, and impaired heart and lung function, which can lead to death. Physalias are accustomed to moving in groups of up to 100 colonies, and sometimes in resorts they have to close entire beaches because of them!

INTERESTING 12 Kinds of Secret Weapons of China

12 Kinds of Secret Weapons of China

The scale of China in terms of population and the area of ​​their territory has not surprised anyone for a long time. The Chinese are a very developed and hardworking people. No wonder they say: "If you do something well, then there will always be one Chinese who will do it even better." This also applies to military equipment and weapons, the development of which Chinese engineers keep secret, but not to say so in a very strict manner. That is why today we offer you to get acquainted with 12 types of secret and most powerful weapons and equipment invented by the Chinese.