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2
votes
1answer
24 views

Effect of extremely hard water on marine life?

When researching water quality standards, I found that a minimum and maximum was set for water hardness. Several sources also state that water can in fact be too hard. The question is how does hard ...
3
votes
2answers
99 views

Do dolphins really sleep?

I have always wondered, if dolphins sleep with one eye opened, do they really sleep at all? According to this article dolphins indeed shut down their brains. I already googled it. No help from ...
1
vote
1answer
200 views

Is it true that oxygen has a diffusion rate in air 10,000 times greater than in water? [closed]

According to the Wikipedia page on the design of gills, oxygen has a diffusion rate in air 10,000 times greater than in water. Is that true? The WP entry refers to: M.B.V. Roberts, Michael Reiss, ...
2
votes
1answer
124 views

In scuba diving, are nitrogen narcosis and high pressure nervous syndrome the same thing?

In training for scuba diving, they tell you that when you're bellow 100 ft or so you have to watch out for changes in mental state that resemble drunkenness. The cause of these mental disturbances is ...