Joshua Rapp Learn

All Stories by Joshua Rapp Learn

  1. Animals

    American bullfrogs may be threatening a rare frog species in Brazil

    A search for environmental DNA from critically endangered Pithecopus rusticus frogs turned up DNA from invasive American bullfrogs instead.

  2. Chemistry

    How Benjamin Franklin fought money counterfeiters

    Researchers are confirming some of the techniques that Benjamin Franklin and his associates used to help early American paper currency succeed.

  3. Environment

    The Deepwater Horizon oil spill ruined long-term shore stability

    For at least eight years, the oil disaster continued to kill soil-retaining marsh plants along the Louisiana coast, accelerating shoreline loss.