10 newly discovered scientific mysteries (Last part)

Researchers are forced to conclude that baby sharks do not have fathers. This proves the phenomenon of asexual sharks.

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Secret 9: Female sharks give birth to asexual

In 2001, a hammer shark was born at Henry Doorly Zoo, Nebraska State (USA), but did not know which of the 3 mothers lived together in a tank. All were released here for at least 3 years.

Scientists have argued, why are they laying off children? Some believe that one of these sharks has mate before being caught, containing sperm in the body for fertilization. Others argue that sharks can give birth in asexual manner by a method called parthenogenesis , which means embryos that do not need sperm.

Many people are skeptical, but by the end of 2007, this has been confirmed by scientists through DNA testing. After determining which female shark is the mother, they exclude that mother's contribution to the shark and in this case, after excluding DNA, there is nothing more. Researchers are forced to conclude that baby sharks do not have fathers and for the first time it demonstrates the phenomenon of asexual sharks.

Noteworthy event: In 2008, scientists learned of a second shark that produced asexually at the Virginia State Oceanographic Center (USA). A black spotted shark more than 2 meters long, weighing 45kg was killed by stress during pregnancy. If a corpse is found, a baby shark is detected and DNA is checked, and a fetal shark is not found in any male shark gene.

Secret 10: The way to fly a bee is not simple

According to calculations, the ratio between the wingspan and the weight of a bee in terms of aerodynamics, it cannot fly. But in reality, it seems that despite scientific theorems, it still . flies. Finally, in 2005, with the help of high-speed camcorders and bee-wing mechanical models, scientists were able to find a way to explain the secret that embarrassed them. long time.

It turns out that bees have flapped their wings up to 230 times a second, which means much faster than insects smaller than them. According to the analysis of the scientists, the combination of how to flap the short wings, turn into a circle very quickly when falling and the reversal, plus an unusually high frequency of frequency is the reason for the bee to fly very flexible as inimitable dances.

Notable facts: To better understand the flight mechanism of bees that carry heavy bodies (of course, compared to their small wings), researchers have forced them to fly in small chambers containing filled with a mixture of oxygen and helium, much thinner than normal air for them to film with a high-speed camera. In that atmosphere, bees are forced to try harder and allow researchers to observe bees' wings and bodies in 'stressed' conditions.