none just what has a four second lifespan , n can be anything
213494
Certain radioactive isotopes have such short half-lives that they almost completely decay into daughter isotopes in less than 10 seconds or even less than 1 second. Look it up on Wikipedia.
333149
I know EM can go up to 100,000x (maybe beyond?), and light can go up to 1000x.  I'm not sure what the limit on EM is, but i think it's less than 800,000x.  So #4 looks right.
153478
It isn't a very good control if your cells die before the experiment is complete.  More info is needed to get a more specific answer.
393919
anything from 7995 to 8004
279815
A pacemaker cell must have a long life (you don't want to have to open someone back up every .week to replace the batteries) and it has to be corrosion resistant.
94568
its electrical properties
24458
Kinetic, potential, nuclear, chemical and electrical.
226239
its between 12 to 15 hrs ...better close to 15 hrs.
342990
One lasts the other one don't.
462067
A minute and a couple of seconds
42456
go for it 2 hours each you only live once
651197
yes. a housefly's lifespan is only about one to three days.\n\nThere is a good concept by Stephen King that says something like the most important factor in the Universe is size. Size determines speed and time concept. He illustrated that if we could imagine that our whole universe is an atom in a blade of grass in a world of much more larger scale, a hundred billion years to this universe can just be a fraction of a second to that world. The relationship is the same with our world and the atomic world and the sub-atomic world and so on. \n\nInsects are relatively small, and they have a shorter lifespan too. Time passes relatively much slower in our panorama when in comparison to them from our point of view. But these things often just go unnoticed. Like an atom or an ant on a blade of grass.
481826
none you greasy wet b@ck
492271
Not for a looooong time.
509133
none its u who asked this great question
269658
none just the driver :)
187322
here is the story  http://www.livescience.com/technology/ap_060404_time.html