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How Do 3D Glasses and Polarised Sunglasses Work?
3D glasses and polarised sunglasses both work by filtering: they let some light through and block the rest. Red-cyan 3D glasses filter by colour, so each eye sees a different...
How Do 3D Glasses and Polarised Sunglasses Work?
3D glasses and polarised sunglasses both work by filtering: they let some light through and block the rest. Red-cyan 3D glasses filter by colour, so each eye sees a different...
Why Is Blood Red, and Why Do Veins Look Blue?
Blood is red because of haemoglobin, an iron-carrying protein that absorbs blue and green light and reflects red. It is red whether or not it carries oxygen; deoxygenated blood is...
Why Is Blood Red, and Why Do Veins Look Blue?
Blood is red because of haemoglobin, an iron-carrying protein that absorbs blue and green light and reflects red. It is red whether or not it carries oxygen; deoxygenated blood is...
Why Are Carrots Orange (and Were They Always)?
Carrots are orange because of beta-carotene, a pigment that absorbs blue light and reflects the rest. They were not always orange: wild carrots are white or purple, and the orange...
Why Are Carrots Orange (and Were They Always)?
Carrots are orange because of beta-carotene, a pigment that absorbs blue light and reflects the rest. They were not always orange: wild carrots are white or purple, and the orange...
What Colour Is the Sun, Really?
The sun is white. It looks yellow from the ground because the atmosphere scatters blue light out of the direct beam, and it looks orange or red at sunset for...
What Colour Is the Sun, Really?
The sun is white. It looks yellow from the ground because the atmosphere scatters blue light out of the direct beam, and it looks orange or red at sunset for...
How Many Colours Are There, Really?
How many colours there are depends on who is counting. Seven in a rainbow by convention, six by eye, around a million distinguishable by a typical person, about sixteen million...
How Many Colours Are There, Really?
How many colours there are depends on who is counting. Seven in a rainbow by convention, six by eye, around a million distinguishable by a typical person, about sixteen million...
Why Does Everything Look Grey in the Dark?
Everything looks grey in the dark because the cells in your eye that see colour, the cones, need a lot of light to work, and the cells that take over...
Why Does Everything Look Grey in the Dark?
Everything looks grey in the dark because the cells in your eye that see colour, the cones, need a lot of light to work, and the cells that take over...