jeweetwelwie wrote:
Question: What will happen when light reaches the speed of 0 m/s?
You'd need a material of infinite refractive index to stop light completely. I don't
think that can exist outside of a singularity, in which case you know as well as anyone what happens.
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kiseki wrote:
"You know, on TV, when the rocket comes out of the Earth...at what point does it come out and how does it come out like that? Because wouldn't there be a hole in the Earth where it came out?"
There
is a hole in the Earth, but it isn't rocket shaped. It's the shape of all the raw materials that went into the rocket, before they were mined...
stephen wrote:
As global populations rise does the Earth get lighter? Presumably minerals would have to be transferred to each new human's body? Or maybe it balances out because they consume more of other resources and decrease populations of other animals?
The amount of global biomass (and carbon sequestration) changes over time, certainly. The proportion of "dead" matter - the planet - and "live" matter - the things living on it - changes with the seasons and over larger scales. There are some interesting figures on biomass production from different biomes
here which imply that human cultivation of land has caused a net decrease in biomass.
mykingdomforano wrote:
For one thing, are we 100% positive that every species has developed traits exclusively for their evolutionary advantage? What if that wasn't true all the time, but only some of the time?
We're 100% positive that every species has
not developed traits exclusively for their evolutionary advantage, there's a lot of blind chance. And the environments that things must prosper in change, after all. One minute you're sitting there contentedly with your comfy nests and your simple tools, the next minute your bastard cousins chop down your house to grow palm oil and millions of years of separate evolution go out the window.
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(That's an extreme example, but environments - being themselves composed of living creatures - evolve together, not in isolation, and the fitness for them that traits bring always changes.)
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