environment
Why Do Bees Matter So Much to Our Food?
Bees are small, but the food on your plate depends on them far more than most people realize. Here is what bees actually do, why so many crops need them, and why their decline worries scientists.
Why Is the Ocean Salty? The Science of Seawater
The rivers that feed the ocean run fresh, yet the sea is salty. Here is where all that salt comes from, how much there is, and why it keeps piling up.