Expenses a company has when it drills for oil or natural gas. Intangible drilling costs are sometimes convenient for a company's tax purposes because it can deduct intangible drilling costs in one year when the company perhaps found little or no oil from profits made in a different year when the company does find oil.
Bruce Lanphear, a professor at Simon Fraser University and also an expert in lead toxicity, said Edwards not only studies the impact of lead in water, but he makes his testing available to communities in need, like he did in Flint.
Doctors at the center looked at blood from children younger than 5 in a report released this fall and found that 4 percent of the 840 children in Flint tested after the water system was changed to the Flint River had elevated levels of lead in their blood, or over 5 micrograms of lead per deciliter.