Dude, why must you put that MacBook Pro laptop on your lap?

Almost all reviews of the new new MacBook Pro have a section on heat and noise. The new model with a Retina Display may run "too hot," depending upon what program it's crunching. Still, here's a tip: even though a certain class of computers are called "laptops" it's not advisable to actually work with them on your lap.

Source: http://www.zdnet.com/blog/apple/dude-why-must-you-put-that-macbook-pro-laptop-on-your-lap/13121

great site here.