Reddit user u/faykin had a lot to say about this topic:
“Your leg veins have one-way valves in them. They work when the skeletal muscles around them contract and release. When you are walking around, the flexion/relaxation of the walking muscles is literally pumping the blood back to your torso. When you are standing still, you aren’t getting that pumping action naturally. You could flex/release your legs intentionally while standing, but it’s not nearly as effective as walking is.”
Why Are Human Eye Colors Restricted To Brown, Blue, Green, And In Extremely Rare Cases, Red, As Opposed To Other Colors?
“Eye color is in the Iris, and the Iris has two layers, a back layer that’s always fully pigmented, and a thicker front layer. The pigment is melanin, same that makes our skin different colors. Now when the front layer is densely pigmented, it appears dark, like brown or even black (though shine a bright enough light and you’ll see black eyes are just very dark brown).
If it’s not pigmented, it appears light blue. Why? Same reason the sky’s blue, light scatters in it. Light scattering is a different topic, but basically short wavelengths (ie blue) bounce differently in the fluffy front layer without pigment. What about in between? Well it turns out if there’s pigment but it’s not super dense, it’s a bit of a lighter brown or dark orange. We call these amber eyes. If it’s between amber and blue, then it’s like a cross between light orange and blue. That’s how you get green eyes.” —u/sixsidepentagon
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