As the company grew, it hired more engineers and generally became more sophisticated. (inc.com)
And, «There's growing pressure for us to teach more than that because we need more engineers and more high school and elementary teachers,» he says. (sciencemag.org)
Solar hot water systems in hard freeze areas need a little more engineering to avoid a freeze - up, but this is not terribly difficult. (dotearth.blogs.nytimes.com)