It's mind-blowing to think that over half of the world’s population fits into this relatively tiny circle. And most of this circle is water.

It's a common knowledge that different breeds of chickens lay different colored eggs. Here I'll explain what chemicals and conditions give rise to these differences.

White eggs

All eggshells are made of calcium carbonate and the white ones have no pigment added.

Brown eggs

The brown colour is caused by protoporphyrin IX, from the hen's haemoglobin, and is coated on the outside of the egg as it moves through the oviduct.

Blue eggs

Blue eggshells have the pigment oocyanin, which does permeate the shell, so the blue coloring will be all the way through.

Green eggs

If a brown layer and a blue layer are crossbred, chances are you will get a green egg when the protoporphyrin IX layer is deposited over the blue oocyanin shell.

Pink eggs

The pinkish tint ...

A supertaster is a individual who lives in a more intense taste world because they have up to twice as many taste buds than the average person. Among individuals of European descent, it is estimated that about 25% of the population are supertasters.

The evolutionary advantage to supertasting is unclear. In some environments, heightened taste response, particularly to bitter plant alkaloids, would represent an important advantage. However, other environments, increased response to bitter may have limited the range palatable goods. In our modern energy rich environment, supertasting may be cardioprotective, due to decreased liking and intake of fat, but may increase cancer risk via deceased vegetable intake. It may be a cause of picky eating ...

I know we've shown this one before, but every spring when the snow melts, Green Lake in Tragöss, Austria overflows and floods the park next to it. For a few weeks, its trees, hiking trails, benches and bridges are submerged in over nine metres of water.

Diphylleia grayi, also known as the skeleton flower, has white petals that turn transparent with rain. When dry, they revert to white. This plant is native to the eastern United States and eastern Asia.

The idea that a chimpanzee and human can interbreed, forming a hypothetical hybrid species known as a humanzee, is not uncommon. Since chimpanzees and humans are closely related species (sharing 95% of their DNA sequence, and 98% of coding DNA sequences), it has lead to contested speculation that a hybrid is possible, though no specimen has ever been confirmed.

While there is a commonality in gene sequence between us and chimpanzees, humans still have one fewer pair of chromosomes (46 chromosomes) than other apes (48 chromosomes). This makes conception between the two species naturally impossible. However, a different numbers of chromosomes is not an absolute barrier to hybridization. Similar mismatches are relatively common in existing spec ...

1)  Roman Numeral IV

Although the Roman numeral for the number 4 has always been taught to have been "IV," according to historians, the ancient Romans probably used "IIII" most of the time. This is partially backed up by the fact that early grandfather clocks displayed IIII for the number 4 instead of IV. Early clockmakers apparently thought that the IIII balanced out the VIII (used for the number 8) on the clock face and that it just looked better.

2)  Base 60

The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."

3)  Fraction Bar

The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole. It wasn't until later in h ...