1. Chemistry

    Why once-gold ceilings in Spain’s Alhambra palace have purple stains

    Moisture infiltrated flawed gilding at the iconic palace, leading to corrosion that deposited gold nanoparticles of the right size to appear purple.

  2. Climate

    How to make recyclable plastics out of CO2 to slow climate change

    Companies are turning atmospheric CO2 from smokestacks and landfills into plastics to shrink their carbon footprint.

  3. Climate

    A carbon footprint life cycle assessment can cut down on greenwashing

    As companies try to reduce their carbon footprint, many are doing life cycle assessments to quantify the full carbon cost of their products.

  4. Environment

    Common, cheap ingredients can break down some ‘forever chemicals’

    Forever chemicals, or PFAS, are harmful compounds that are very difficult to degrade. But some are no match for lye and dimethyl sulfoxide.

  5. Chemistry

    These researchers are unlocking Renaissance beauty secrets

    An art historian has teamed up with chemists to uncover the science behind cosmetics used around 500 years ago.

  6. Chemistry

    Cats chewing on catnip boosts the plant’s insect-repelling powers

    When cats tear up catnip, it increases the amount of insect-repelling chemicals released by the plants.

  7. Chemistry

    A pigment’s shift in chemistry robbed a painted yellow rose of its brilliance

    The degradation of an arsenic-based paint stripped shadows and light from a still life flower in a 17th century work by painter Abraham Mignon.

  8. Ecosystems

    Just 3 ingredients can quickly destroy widely used PFAS ‘forever chemicals’

    Ultraviolet light, sulfite and iodide break down enduring PFAS molecules faster and more thoroughly than other UV-based methods.

  9. Chemistry

    Scientists made a Möbius strip out of a tiny carbon nanobelt

    A twisted belt of carbon atoms joins carbon nanotubes and buckyballs in the list of carbon structures scientists can create.

  10. Agriculture

    Oat and soy milks are planet friendly, but not as nutritious as cow milk

    Plant-based milks are better for the environment, but nutrition-wise they fall behind cow milk.

  11. Chemistry

    Grainy ice cream is unpleasant. Plant-based nanocrystals might help

    The growth of large ice crystals in ice cream produces a coarse texture. A cellulose nanocrystal stabilizer could help keep the unwelcome iciness away.

  12. Climate

    Smoke from Australia’s intense fires in 2019 and 2020 damaged the ozone layer

    Massive fires like those that raged in Australia in 2019–2020 can eat away at Earth’s protective ozone layer, researchers find.