Adult stem cells are also problematic, as they are difficult to identify, purify and grow, and simply may not exist for certain diseased tissues that need to be replaced. ↗
It's difficult working with very rich actors, because inevitably they become a little spoilt, and the managers and agents tend to control things more than is healthy. ↗
And I really do think that the difficulty of research makes it more real to you than punching a thing to find out how many men were killed at this particular action. ↗
Hitting a baseball well, as in cricket, is a very rare skill. One of most difficult things to do in the world to do, hitting a ball coming at you at ninety miles an hour with a round bat. Wonderful to watch. ↗
It's difficult for me to feel that a solid page without the breakups of paragraphs can be interesting. I break mine up perhaps sooner than I should in terms of the usage of the English language. ↗