Roberta Kwok

All Stories by Roberta Kwok

  1. Animals

    Close cousins

  2. Animals

    Alien carp leap onto the scene

    Last summer, Alison Coulter got a big surprise as she piloted a boat along the Wabash River in Indiana. Startled by her boat’s motor, a 60-centimeter (24-inch) carp leaped out of the river. In some cases, jumping Asian carp have broken a boater’s nose, jaw or arm.

  3. Health & Medicine

    Wanted: ‘Smart’ cleaners

  4. Animals

    This shrimp packs a punch

  5. Animals

    Cool Jobs: Delving into dung

  6. Chemistry

    Secret signals

  7. Animals

    When the nose no longer knows

  8. Animals

    Monkeys’ mistake detector

  9. Genetics

    DNA hints at ancient cousins

  10. Climate

    Iron versus climate change

  11. Climate

    Weird weather

  12. Health & Medicine

    Tomatoes’ tasteless green gene

    The tomatoes your great-grandparents ate probably tasted little like the ones you eat today. The fruit used to have more flavor. A lot more flavor. In fact, tomatoes “were once so flavorful that you could take one in your hand and eat it straight away just like we regularly eat apples or peaches,” according to plant scientist Alan Bennett. He belongs to a team of international scientists who now think they know one reason why the fruit has lost so much flavor. Although some unripe tomatoes have a dark green patch near the stem, farmers prefer that their unripe tomatoes are the same shade of green all over. The consistent coloring makes it easier for them to know when the fruit should be picked.