Before Aperture Science became a worldwide leader in Science, they were a worldwide leader in shower curtains. In fact, the majority of Cave Johnson's wealth was amassed thanks to contracts with the U.S. military to provide shower curtains to military bases (except the Navy). In fact, it was the Navy that was the purported downfall of Cave Johnson. Rumor has it, Cave was exposed to high levels of mercury while developing deadly shower curtains for the House Naval Appropriations committee.
This shower curtain, while emblazoned with the Aperture Science logo, probably doesn't contain mercury or radiation. Not if youre in the control group at least. (Pssst, you're in the control group.)