Separating the ones needed for the transistors is laborious, and so is guiding the nanotubes to the right places.
They developed technologies appropriate to their needs, such as solid-fuelled rockets that, while not as powerful as the liquid-fuelled ones needed for serious space-flight, blew up less often and could be kept permanently ready for launch.
Happily, the steps and timing needed to advance your career as a scientist are remarkably similar to the ones needed for a positive tenure decision.
Although the couple swore never to buy any more Lego bricks, Ms Weightman agreed they could find more storage for the 1,200 new white ones needed for the house's snow-covered roof.
If your school provides lockers, you can leave majority of your books/assignments in your locker, but if you're usually late to class it might be best to leave all the ones needed for that day in your bag.
Taxi – just the one needed – for Frankie and Muhala.
But perhaps that's all the computing power one needs for lounging purposes.
One needs, for example, to understand the currently accepted "standard model" of particle physics (bosons, hadrons, fermions and all that).
"I think this is a very effective dose and one needed for individuals who experience chronic pain," she said.
But its burn falls far short of the sustained one needed for true fusion energy.
