The edited video is great, but I wonder how happy mum was to have the camera in her face in the delivery room?

As a full time stay at home dad I really appreciate how interested and involved with his family he seems to be. Some dads seem to see it all as the woman's job and don't really get involved which is a real shame. Not just for the kids but for the dads too. Kids can be infuriating, but they can be really cool too

They don't think it be like it is, but it do.

My brain hurts...

The human brain is such an incredible thing.

Something tells me he's done that once or twice...

Is that when they make something impressive yet strange and mysterious?

Beautiful. I could watch this guy all day. Nice sift, thank you

Regarding the method for finding the holes, I had no idea either. When he scored the radius it was like a lightbulb coming on in my head. It's so simple, and so obvious once you've seen it. Genius.

Thanks

Not sure if funny bloke or really irritating!

I'm erring on the side of funny bloke, but he's walking a fine line there...

Massive belly laugh at 2:58!

Exposure to gravity, or lack of it, will eventually cause changes in the body as it evolves. Not the long heads and bodies vaire2ube alludes to but other things, like maybe a resistance to osteoporosis.

If you imagine everyone on earth suddenly has to live in a weightless environment I'm sure you can imagine how it would help some people and damage others. Those with dangerously high blood pressure could end up bursting a blood vessel in the brain, killing them, whereas others with dangerously low blood pressure would survive better. Weightlessness would lead to selection favouring low blood pressure in this instance. I'm not sure if this exact example would happen, but I'm sure you can imagine that making a huge change to the environment such as removing the effect of gravity would have a profound effect on our bodies, and that effect could then lead to natural selection and evolution.

>> ^xxovercastxx:

@<a rel="nofollow" href="http://videosift.com/member/Estuffing17" title="member since May 2nd, 2010" class="profilelink">Estuffing17
Actually, because visible green light is at a higher energy level than red light, if an objects energy gap is high enough to let green light through, then red light will also pass through because it has even lower energy levels, not the other way around.
That's exactly what I said in my example.
As far as a translucent green material is concerned, when we perceive an object to have color, it is because that objects atoms are arranged in such a way that it reflects that wavelength of light (green in this case) back to our eye, while either absorbing, refracting or letting pass through photons of other wavelengths. Just because a piece of glass is green does not mean it will not allow other higher and lower energy photons to pass through it.
Green glass, as I understand it, is green because it's filtering out other colors. It's a simplified example, yes. Obviously you can have a little yellow or blue or whatever mixed in and it still looks "green".
But the energy gap explanation seems to mean that "green" glass would be letting all red, orange, and yellow light through since they are lower energy levels. It's one thing to say a little bit of another color is coming through and it's imperceptible. If all the "weaker" colors are coming through along with the green, it doesn't seem to me like it would look very green.


All the light at all the energy levels will pass through the material, you're right. But the extra bit that makes this make sense is that this isn't the only thing happening. You've seen a simple explanation of one thing. The other wavelengths of light are passing through the material, but not all in a straight line. Their paths are diverted and dispersed so you don't get a meaningful amount of these wavelengths of light entering your eye.

This is the reason the sky is blue. Light is refracted by particles in the substance through which it is traveling. The closer the wavelength of the light is to the particles it's being refracted by, the more it's course is altered. The blue end of the spectrum has the closest wavelength to the size of particles in the air.

When you look at the sky with your back to the sun, the light that makes it to your eyes will obviously have had to have it's path altered a lot by the particles in the air. Only the wavelengths that are closest to the size of the particles in the air will be altered this much, hence the sky looking blue.

The lower the sun, the more air there is for the light to pass through and the more the other wavelengths will be refracted. At midday on the equator the sun in a white dot surrounded by blue. There isn't enough air between you and the sun to cause anything other than the blue light to be refracted back to your eye, so if you're not looking at the sun (not good...) you're only going to see blue. At sunset there is a lot more air between you and the sun, enough for the longer wavelengths to be affected, hence the red colours spreading away from the sun causing the firey sunsets we all love.

So, to sum up; just because all the wavelengths of light can pass through something it doesn't necessarily follow that they aren't affected in any way at all. They can pass through but have their paths altered, hence the different colours you see.

I'd love a fuller explanation of this. How do the particles affect the protons? What makes them alter course?

I'm betting that's a lot harder to co-ordinate than it looks! Works well though.

This is why I love maths, but hate numbers. Numbers get in the way.

I learned a lot of this stuff when I trained as a technical illustrator. You can work stuff out with numbers, but it's often a lot easier just to draw the patterns and work to those.