And there was resistance to the temptation in Washington to turn these things into political talking points, but allow them instead to be more organic and focused on the substance -- and not just on fiscal issues, as I said, but immigration reform, gun violence, energy independence, education -- the whole range of issues that are the President's priorities and they also happen to be the American people's priorities.

WHITEHOUSE: Press Briefing

Also, scientists at the Hong Kong Polytechnic University have been able to build a nano-thin layer of particles of titanium dioxide, a substance that reacts with sunlight to break down dirt and other organic material.

FORBES: Nanotechnology's Disruptive Future

They built a thin layer, or "nanostructure, " using minute particles of titanium dioxide, a substance that reacts with sunlight to break down dirt and other organic material and can be coated on cotton to keep the fabric clean.

CNN: Washing no longer dirty work