Solar cells,or photovoltaics, are widely made using wafers of silicon that are stiff and brittle.

VOA: standard.2010.02.19

"We think because of the long term effect of the bone, there may be stress fractures that are not repairing and I think the bone is becoming brittle, and it's not exactly as if it occurs without any warning, but it occurs suddenly with minimal trauma."

VOA: standard.2010.03.14