What are def/off linemen allowed to do with their hands and arms?

I don't really get what constitutes "holding". Are the rules the same for both offensive and defensive linemen?

Why do the beaches in some areas have different coloured sand?

The color of the sand on beaches is in part determined by the type of rock that is the most plentiful in the coastal location. That is to say, whatever is near. In Hawaii there is black sand, green sand, fine white sand that's nearly like sugar in texture, broad coarsely ground tawny sand as well. All these types of sand are colored by their environment. Black sand is predominantly made up of volcanic cinder, as is Green sand. Green sand is predominantly composed of olivine, a green volcanic gl like stone.White sand and tawny sand are composed of shell matter, coral and sea rocks. The sand in New Brunswick may be colored by iron rich stone that have been broken down by ions of weathering.

Question about Osmosis...?

Is osmosis a type of pive transport involving things like calcium? Or am I getting it mixed up with something else?

When we take the next step in human evolution and create a new race, what improvements should be focused on?

With all the new technology being developed, we will soon be able to create a new version of humanity. Examples would be neuro-computer interfaces, bio-electric energy created by solar power, ending the aging process, and an extremely durable exoskeletion. What enhancements or alterations do you think would be most important?

On Okami, what is the list of moves to use on certain enemies to get demon fangs?

On Okami (for the wii), after you defeat a demon, they rise into the air for about 1.5 seconds. If you use a certain finishing move on them, you'll get a demon fang piece. Does anyone have the list of finishing celestial brush techniques that Amaterasu uses on the enemies to get the fang piece?

The television show how house?

does Hugh laurie portraying or acting as house having any medical knowledge or is he just reading scripts?

Can someone please give me some tips on how to get curly/wavy hair?

i have naturally straight hair, so i tried scrunching with a lot of Aussie Sprunch spray, but it takes me over 5 minutes to achieve the curly/wavy style i want, and i have to do it before i sleep. i cant invest in rollers or irons, so can someone list some drugstore curling creams or mousses to achieve this look? : a href="http://www.glamourhair.com/images/pophairextensions/HH-ClipIn-Extensions---Wavy.jpg" rel="nofollow"http://www.glamourhair.com/images/pophai…/a