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Posted by bio_man   November 29, 2021   304 views

A wholphin is a rare fertile hybrid born from mating a bottlenose dolphin (Tursiops truncatus) (mother), and a false killer whale (Pseudorca crassidens). Although they have been reported to exist in the wild, the first captive wholphin was born in 1945, where a bottlenose dolphin and a male false killer whale shared a pool.

The wholphin's size, color and shape are intermediate between the parent species. For example, an adult wholphin has 66 teeth - intermediate between a bottlenose (88 teeth) and false killer whale (44 teeth). They are smaller than a false killer whale but are larger than a normal bottlenose.

Normally, when two different, yet similar species mate, such as a female horse and a male donkey forming a mule, the progeny is expec ...

Animals Ocean Meiosis Fertility Dolphin False Killer Whale
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Posted by bio_man   November 25, 2021   485 views
The Loretto staircase – built within the Loretto Chapel in New Mexico, USA – is by far the most remarkable staircase ever built. It features a double-helical spiral structure that spans 20 feet in altitude, and remains intact without the use of a central pole. The staircase is built mostly out of wood and is held together by wooden pegs and glue rather than nails or other hardware.

The staircase is venerated by Catholics as being miraculous, not due to its marvel, but based on the events that have been passed down by the Sisters of chapel ever since it was built in the late 1800s. Before the construction of the Chapel could be completed, the architect responsible for the building's design had suddenly died, leaving the nuns without access to ...

Construction staircase physics
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Very beautiful
Posted on Nov 25, 2021 by Tina
Posted by bio_man   November 23, 2021   523 views

The Four Color Theorem is a famous mathematical theorem that states that no more than four colors are required to color the regions of any map so that no two adjacent regions have the same color. Adjacent means that two regions share a common boundary curve segment, not merely a corner where three or more regions meet. Unlike other proofs before its discovery, computers were used to resolve this long-standing mathematical conjecture that was first proposed in 1850 by Francis Guthrie. After more than a century later, mathematicians, Kenneth Appel and Wolfgang Haken, finally derived its proof in 1976, and determined that it is practicality impossible for humans to verify it without the use of a computer. According to the four color theorem, a ...

mathematics history proofs logic maps
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Posted by bio_man   October 15, 2021   1474 views

A defining features of learning mathematics is being able to read, write, and discover proofs. A proof is a method of communicating a mathematical truth to another person who speaks the "language" of mathematics. It's a way of showing whether a statement made is absolutely true or false.

I recently came across a fallacious proof attempting to show that the integer one equals two – shown are the steps to accomplish this. Common sense dictates that this is impossible, but the proof is somewhat convincing to the untrained eye. However, most people with basic algebraic knowledge should be able to pick out the mistake, so take a minute or two to see if you can identify the incorrect step. If you're stuck, don't give up so quickly! It's easier ...

Fallacies Division by zero
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It is very easy to prove 1 = 2, but we all know it is wrong. But, most of us don’t know how to prove it wrong. if you use different assumptions then 1 is not equal to 2.
Posted on Oct 15, 2021 by cloveb
Try solving this one Face with Stuck-out Tongue

Posted on Oct 17, 2021 by duddy
Posted by bio_man   October 8, 2021   1826 views

Birthmarks are congenital marks on the skin that appear at birth and occasionally disappears spontaneously. The term nevus refers to a benign cutaneous tumor consisting of blood capillaries. Such tumors, which rarely spread from their original site and are not dangerous, vary in color according to whether the capillaries composing them carry arterial or venous blood. The popularly termed cherry marks and port-wine stains (shown below) are nevi on a level with the surface of the skin. Certain other vascular nevi, commonly known as strawberry or raspberry marks (scientifically known as hemangiomas), are slightly elevated above the surface. These can appear anywhere on the body's surface, including the airway within the nose. The former Soviet ...

Birthmarks Genetics Strawberry hemangioma Rare conditions Skin condition
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