Category: Science (page 6)

I have been thinking to do something similar with fly courtship behaviour…

Great infographic based on the location and date information of events of Wikipedia.

A History of the World in 100 Seconds from Gareth Lloyd on Vimeo.

The majority of humans are trichomats i.e. we have three different types of cells in our eyes, each sensitive to a different colour. I already knew about colour blind humans, i.e. dicrhomats. About 1/20 of males are colour blind.

Now I found out that some humans, apparently, are tetrachromats. Find out if you are one here (may not work on all computer monitors?)

Many animals are normally tetrachromats, for example birds. Then there are crazy examples like the mantis shrimps which seem to have cells sensitive to 16 different light wavelengths!

Very concise and fascinating summary of all (?) of Earth’s movements.

This is why astrology cannot work: the position of the stars on the sky keeps changing, and is certainly different since the time astrology got started. Astrological predictions have not changed to accommodate the current position of the constellations…

More interestingly, some of the variation in the Earth’s orbit explains the ice ages.