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the interesting and cool thing about this is that alex happened to be at keck when the news came through, which allowed him to quickly point the monster scope at m51. supernova usually last for months and months, but it is rare for us to get such early data with such powerful machines. it can only really happen randomly.
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didn't have time to read the whole paper. exam on this stuff tomorrow though, wonder if I can use this on an essay question?
these kinds of hand-wavy experiments will continue to crop up as our ability to measure the brain outstrips our ability to understand.
it's way to easy to point an fMRI at a region "linked" to a particular behavior or type of thinking, and then wax poetic about what the increased activity may or may not mean. sad coming from a relatively respected lab.
the vast majority of control over where blood flows in the body is at the level of arterioles, which are small arteries found before capillary beds.
to be completely accurate, arteries do indeed 'deliver' blood, as they are responsible for the distribution of the blood to the body. feel free to pop open oed, which I'm sure a doctor of your caliber has at the ready, if you doubt me.
additionally, the elastic quality of the major arteries allows for pumping of blood outside the heart, which more closely fits with your highly specific (but in the context of the discussion at hand, meaningless) definition of deliver. and let's not forget the smooth muscle around arteries which can contract, leading to yet another form of active 'delivery' of blood.
thanks for your career advice, doc. it has been taken to heart.