Around the Garden
Ten photographs from the editor’s garden and four ways to handle them. Slide down a flower stalk, turn up the light on a leaf with only its veins left, drag a magnifying glass across two mushrooms, step in close.
The Date in the Gut
Two peoples in Bolivia and Tanzania, whose ancestors parted tens of thousands of years ago, carry more than 1,200 of the same gut bacteria. The bacteria's DNA also holds a date for when their lines last traded genes: about 17,000 years ago. Scroll to see how a clock is read out of the letters.